The Basics of 3D Printing
The Basics of 3D Printing
What Every Beginner Should Know
Have you ever wanted to turn a digital idea into a real, physical object? That’s exactly what 3D printing allows you to do — and it’s more accessible than ever. Whether you’re a designer, student, hobbyist, or engineer, understanding the basics of 3D printing can open up exciting opportunities for creativity and innovation. In this comprehensive guide from BritForge 3D, you’ll learn how 3D printing works, what materials you can use, and why it’s changing the way we make things.
What is 3D Printing?
3D printing, also called additive manufacturing, is a process where objects are created layer by layer from digital designs. Unlike traditional methods that cut, drill, or cast shapes, 3D printing adds material exactly where it’s needed. This makes it possible to produce complex geometries that would be impossible or very expensive with conventional manufacturing.
How Does 3D Printing Work?
Here’s a simple breakdown of the process:
- Design: Create your 3D model using CAD software, or download it from sites like Printables or Thingiverse.
- Slicing: Use slicing software (e.g., Cura or PrusaSlicer) to convert your model into layers. The software also generates instructions for the printer.
- Printing: The printer follows these instructions, depositing material layer by layer until the part is complete.
This process can take anywhere from minutes to days, depending on the size, complexity, and printer settings.
Common Types of 3D Printing Technologies
For beginners, the two main types of 3D printing are:
- FDM (Fused Deposition Modelling): The most common and affordable option. FDM printers work by melting and extruding plastic filament through a nozzle, building parts one layer at a time. They’re great for prototyping, mechanical parts, and everyday items.
- SLA/DLP (Resin Printing): These use liquid resin cured by UV light for extremely detailed, smooth prints. SLA is ideal for jewellery, miniatures, or objects requiring fine detail, though it involves more post-processing.
Materials for 3D Printing
Choosing the right material is critical for your project’s success. The most popular beginner materials include:
- PLA: Easy to print, eco-friendly, and perfect for visual models or prototypes.
- PETG: Durable, flexible, and resistant to moisture, making it ideal for functional parts.
- ABS: Tough and heat-resistant, but more challenging to print due to warping.
- Resin: Used in SLA printing for high-detail parts with smooth surfaces.
Each material has its pros and cons depending on strength, flexibility, and appearance. Knowing these differences will help you select the best option for your project.
Benefits of 3D Printing vs. Traditional Manufacturing
3D printing offers several advantages over traditional manufacturing techniques:
- Faster prototyping reduce design cycles from weeks to days.
- Lower costs for small batches or one-off items.
- Freedom to design complex shapes and internal structures impossible with subtractive methods.
- Reduced material waste since only the needed material is used.
This flexibility makes 3D printing a powerful tool for startups, inventors, and anyone wanting to innovate on a budget.
Why Order 3D Prints Instead of Buying a Printer?
While owning a 3D printer can be rewarding, it requires time, maintenance, and knowledge to keep running smoothly. For many individuals and businesses, ordering prints from professionals like BritForge 3D saves time and ensures better quality. We use industrial-grade machines and provide a range of materials and finishes without you needing to worry about calibration, failures, or post-processing.
How to Get Started with BritForge 3D
Ready to turn your ideas into reality? Start by uploading your 3D model on our website. Our online tool gives you instant pricing, allows you to choose materials and finishes, and guides you through the process. Our experienced team will review your design, print your part with precision, and deliver it quickly — anywhere in the UK.
Conclusion
3D printing is revolutionising how we create, prototype, and manufacture. By learning the basics, you open doors to endless creative and professional possibilities. Whether you need help choosing materials, fixing your 3D model, or getting a part printed with industrial precision, BritForge 3D is here to support you every step of the way.
A Technical Guide – Part Nine
Understanding 3D Printing File Types: STL, 3MF, OBJ and G-code Explained
When a customer uploads a file for 3D printing, the first question we consider is not how large the part is or what material it requires. The first question is much simpler: what file format are we working with?
File type plays a significant role in print reliability, geometry accuracy, material settings, and even colour information. Many users treat file formats as interchangeable, but they are not. Each format exists for a reason, and choosing the correct one can improve workflow efficiency and reduce print errors.
In this lesson, we will explore the four most common file types used in 3D printing: STL, 3MF, OBJ, and G-code. More importantly, we will examine when to use each one and why.
Why File Format Matters in 3D Printing
A 3D printer does not understand design software files such as SolidWorks, Fusion, or Blender files directly. Instead, those designs must be exported into a format that slicing software can interpret.
The file you export determines:
- How geometry is stored
- Whether units are preserved
- Whether colour and material data are included
- Whether slicing settings travel with the model
- How easily the file can be repaired
Using the wrong format can introduce scaling issues, lost metadata, corrupted geometry, or unnecessary workflow steps.
Understanding file formats allows you to control your process rather than react to problems later.
STL – The Industry Standard
The STL file (Standard Tessellation Language or StereoLithography) is the oldest and most widely recognised format in 3D printing.
STL files describe geometry using triangles. Every curved surface is approximated by a mesh of small triangular faces. The smaller and more numerous the triangles, the smoother the surface appears.
However, STL files contain only geometry. They do not store:
- Units (mm or inches)
- Colour
- Material data
- Print settings
This simplicity is both a strength and a limitation.
Benefits of STL
STL is universally supported. Nearly every slicer, CAD package, and 3D printer workflow accepts STL files. Because the format is simple, files are generally stable and predictable.
For single-material functional parts, STL is often perfectly adequate.
Limitations of STL
Because STL does not store units, scale errors are common. A part designed in millimetres may open as inches in another system.
STL also cannot store multiple bodies intelligently, colour data, or advanced metadata.
For simple prints, STL works well. For more complex workflows, it begins to show its age.
3MF – The Modern Alternative
3MF (3D Manufacturing Format) was developed to solve the limitations of STL.
Unlike STL, 3MF files store:
- Units
- Multiple bodies
- Colour information
- Material assignments
- Print settings (when exported from slicers)
This makes 3MF far more powerful for modern workflows.
Why 3MF Is Often Better for 3D Printing
Because 3MF preserves units, scaling errors are eliminated. What you design is what opens in the slicer.
3MF also allows multi-material and multi-colour information to travel with the file. If you are using a multi-material printer, this is critical.
Additionally, some slicers store support placement and slicing profiles inside the 3MF file. This makes collaboration easier because another user can open the file exactly as intended.
When to Choose 3MF
If you are working in a modern slicer and want to preserve configuration, or if you are printing multi-material parts, 3MF is usually the better choice.
For professional workflows, 3MF is increasingly becoming the preferred format.
OBJ – Geometry with Visual Data
OBJ files are commonly used in animation and 3D modelling rather than manufacturing, but they also have applications in 3D printing.
Like STL, OBJ files describe geometry through mesh data. However, OBJ files can also store:
- Colour data
- Texture references
- Surface information
This makes OBJ useful for full-colour printing systems.
When OBJ Makes Sense
If you are printing artistic models, figurines, or textured parts that require colour mapping, OBJ can be valuable.
However, OBJ files can be larger and more complex than STL. They may also include unnecessary data for simple functional prints.
For most engineering parts, OBJ is not required.
G-code – The Machine Instruction File
G-code is very different from STL, 3MF, or OBJ.
While those formats describe geometry, G-code describes movement instructions for the printer.
Once a file is sliced, the slicer converts the model into G-code. This file contains:
- Exact nozzle movements
- Extrusion rates
- Temperature commands
- Fan speeds
- Layer heights
G-code is printer-specific. It is generated for a particular machine, with specific settings.
Why You Don’t Share G-code as a Design File
Because G-code contains machine instructions, it is not portable in the same way geometry files are.
A G-code file created for one printer may not work correctly on another due to:
- Different bed sizes
- Firmware differences
- Extruder configurations
- Temperature limits
For this reason, when sending a file to a professional 3D printing service, you should always send geometry files (STL or 3MF), not G-code.
Choosing the Right File Type
So how do you decide?
If you are printing a simple single-material part and need universal compatibility, STL is safe and reliable.
If you want to preserve units, materials, and advanced data, 3MF is the superior modern option.
If you are working with colour textures or artistic models, OBJ may be appropriate.
If you are printing directly from your own slicer to your own machine, G-code is the final production file — but not something to share externally.
Professional Workflow Recommendation
At BritForge3D, we recommend:
- 3MF for most modern workflows
- STL for compatibility and simple parts
- Avoid sending G-code unless specifically requested
We re-slice all files to ensure compatibility with calibrated machines and optimised material profiles.
Sending geometry files instead of machine code allows us to ensure print strength, dimensional accuracy, and material suitability.
Common Mistakes to Avoid
One of the most common mistakes is exporting STL with extremely low mesh resolution. This results in visible flat facets on curved surfaces.
Another mistake is forgetting to check units before export.
Finally, some users send G-code assuming it guarantees identical results. In reality, it can introduce compatibility risks.
Final Thoughts
Understanding file formats is not just about software preference. It is about workflow control.
Choosing the correct file format improves reliability, reduces errors, and supports better collaboration between designers and print services.
As 3D printing evolves, 3MF is increasingly replacing STL for professional workflows. However, STL remains deeply embedded in the ecosystem.
In the next guide, we will explore how to prepare files properly before upload — including mesh repair, manifold checks, and design validation.
The Basics of 3D Printing – A Beginner’s Guide
3D printing is transforming how we prototype, design, and manufacture
Making it more accessible than ever. Whether you’re a hobbyist, entrepreneur, or engineer, understanding the fundamentals of 3D printing is the first step toward creating high-quality prints that solve real-world problems. In this beginner’s guide, BritForge3D walks you through how 3D printing works, what you need to get started, and why it’s revolutionising design in the UK and beyond.
What Is 3D Printing?
3D printing, or additive manufacturing, is the process of building three-dimensional objects layer by layer using digital models. Unlike traditional manufacturing, which often removes material (e.g., cutting or milling), 3D printing adds material only where it’s needed, resulting in less waste and more freedom in design.
How Does It Work?
The process starts with a 3D model usually created in CAD (Computer-Aided Design) software or downloaded as an STL file. This model is then sliced into layers using software like Cura or PrusaSlicer. Each layer is converted into instructions (G-code) that guide the printer to lay down material typically plastic filament one layer at a time.
Popular 3D Printing Technologies
- FDM (Fused Deposition Modelling) – Melts and extrudes plastic filament; most common and beginner-friendly.
- SLA (Stereolithography) – Uses UV light to cure liquid resin; ideal for fine detail and smooth surfaces.
- SLS (Selective Laser Sintering) – Uses a laser to fuse powdered material; used more in industrial settings.
What You Need to Start 3D Printing
To begin your journey, you’ll need:
- A 3D printer (FDM is a great start)
- Filament (like PLA or PETG)
- Slicing software
- A 3D model file (you can design your own or download from sites like Thingiverse)
No workshop required many home printers fit on a desk and plug into a standard socket.
What Can You Print?
From mechanical prototypes and functional tools to cosplay props and custom gifts if you can design it, you can likely print it. The possibilities include:
- Phone holders and mounts
- Replacement parts and brackets
- Custom enclosures for electronics
- Educational models and architectural prototypes
Common Beginner Mistakes (and How to Avoid Them)
Getting a good print often comes down to careful preparation. Common beginner issues include poor bed adhesion, incorrect temperature settings, or using the wrong material. Take time to level your bed, experiment with slicer settings, and start with reliable filaments like PLA. Don’t worry every failed print is a step toward mastery!
Why 3D Printing is Growing in the UK
With the rise of small-scale makers, startups, and local manufacturing, 3D printing is booming in the UK. Services like BritForge3D empower individuals and businesses to upload designs and receive high-quality prints without needing their own equipment. We help turn ideas into reality, quickly and professionally.
Start Your First Print with BritForge3D
Not ready to buy a printer yet? No problem. At BritForge3D, you can simply upload your design, choose your material, and get a quote instantly. We’ll handle the printing and ship it right to your door hassle-free.
Conclusion
3D printing opens a world of possibility. Whether you’re experimenting with your first model or looking to scale up to commercial prototyping, the basics outlined in this guide will get you on the right path. BritForge3D is here to support your creative journey one layer at a time.
A Technical Guide – Part Ten
Why Doesn’t My 3D Scanner Capture Detail as Small as 0.02 mm?
One of the most common questions people ask after purchasing or using a 3D scanner is why the scanner does not capture detail as precisely as the specification suggests. Many scanners advertise resolutions such as 0.02 mm, yet when scanning real-world objects the captured model appears far less detailed.
This can be confusing and sometimes disappointing, especially for users expecting extremely fine detail. However, the answer usually lies not in the scanner being faulty, but in how scanner specifications, resolution, accuracy, and real-world conditions actually work.
Understanding these factors helps you get the best results from your scanner and avoid unrealistic expectations.
Resolution vs Accuracy – The First Source of Confusion
When a scanner advertises a resolution of 0.02 mm, this does not mean it can reliably measure every feature at that size.
In most scanners, resolution refers to the smallest point spacing the scanner can record, not the true measurement accuracy.
These are two very different things.
Resolution describes the density of points in the captured mesh.
Accuracy describes how close those points are to the true dimensions of the object.
For example, a scanner may generate points every 0.02 mm, but the true dimensional accuracy may only be ±0.05 mm or ±0.1 mm depending on the scanning conditions.
This distinction explains why extremely fine features may not appear clearly even though the specification seems capable of capturing them.
Surface Properties of the Object
Another major factor affecting scan detail is the surface of the object being scanned.
3D scanners rely on reflected light or structured light patterns to detect geometry. Certain surface types interfere with this process.
Highly reflective surfaces can scatter the projected light pattern, making it difficult for the scanner to calculate depth accurately. Similarly, very dark or matte surfaces may absorb too much light, reducing contrast.
Transparent or glossy materials are particularly challenging because the scanner may detect reflections rather than the actual surface.
This is why professional scanning workflows often use temporary scanning sprays to create a uniform matte surface that improves data capture.
Distance from the Scanner
3D scanners operate within an optimal working distance. If the object is too close or too far away, the scanner cannot resolve small details properly.
Most scanners have a focus range or optimal capture distance, and fine detail is only captured when the object sits within this range.
If the scanner is held too far away, point density decreases and small features are lost. If it is too close, the scanner may struggle to maintain tracking or capture complete geometry.
Maintaining a consistent scanning distance is therefore critical for achieving the best resolution.
Movement and Tracking Stability
Handheld scanners rely on stable tracking of the object’s surface while scanning. If tracking is lost or unstable, the software may smooth or average data during reconstruction.
This smoothing can remove small details that technically fall within the scanner’s resolution.
Even small hand movements or vibrations can affect point alignment. Professional scanning often uses tripods, turntables, or fixed scanning rigs to minimise movement and maximise accuracy.
Lighting Conditions
Ambient lighting also influences scan quality.
Strong sunlight or bright studio lighting can interfere with structured light patterns used by many scanners. Excessive ambient light reduces contrast between projected patterns and the object’s surface.
Most scanners perform best in controlled indoor lighting where the projected pattern remains clearly visible to the sensors.
Mesh Processing and Software Filtering
After scanning, software converts raw point cloud data into a mesh. During this process the software may apply smoothing, noise reduction, and hole filling.
These algorithms are designed to produce clean models but can unintentionally remove small features.
Many scanning applications include adjustable settings for mesh smoothing or detail preservation. Lower smoothing levels often retain more fine geometry.
Understanding these processing settings can significantly improve the final result.
Object Size vs Feature Size
Resolution specifications are also influenced by the overall size of the object being scanned.
Scanning a large object spreads the available point density across a wider area. This means fewer points represent small features.
In contrast, scanning a smaller object concentrates point density and improves feature capture.
For this reason, some scanners perform better when scanning smaller sections individually rather than attempting to capture a large object in one pass.
Calibration and Scanner Setup
Just like 3D printers, scanners require proper calibration.
Calibration ensures that cameras, sensors, and projection systems align correctly. If calibration drifts over time, accuracy can decrease.
Manufacturers typically provide calibration boards or routines. Running these periodically helps maintain optimal scanning performance.
Understanding Real-World Scanner Performance
In practice, the advertised resolution of a scanner represents the best-case scenario under ideal conditions.
Real-world scanning involves variables such as lighting, object surface properties, movement, and software processing. Each of these factors can reduce the amount of detail captured.
This does not mean the scanner is performing poorly. It simply reflects the difference between laboratory specifications and practical operation.
Improving Your Scan Results
While scanners cannot always achieve their theoretical limits, several techniques can significantly improve results.
Using matte scanning spray, maintaining the correct distance, scanning in stable lighting conditions, and adjusting mesh processing settings can all enhance detail capture.
Additionally, scanning smaller sections and combining them later often yields better results than scanning a large object all at once.
These practical adjustments often make the difference between an average scan and a highly detailed one.
Final Thoughts
The advertised resolution of a 3D scanner represents the maximum point density it can achieve under ideal conditions, not the guaranteed detail level in every scan.
Factors such as surface reflectivity, lighting, distance, motion, calibration, and software processing all influence the final result.
Once you understand these variables, scanning becomes far more predictable and far less frustrating.
With the right setup and expectations, modern 3D scanners are capable of producing highly detailed and accurate models suitable for reverse engineering, product design, and digital archiving.
Next Technical Guide
In the next guide, we will explore how to prepare scanned models for 3D printing, including mesh repair, hole filling, and converting scan data into usable CAD geometry.
How to Choose the Right Material for Your 3D Print
When it comes to 3D printing, selecting the right material can make the difference between a strong, high-quality print and a failed project. With so many options available from PLA and PETG to ABS and resin, it’s essential to understand the unique properties of each material before starting your print. In this guide, BritForge3D breaks down the most common materials and helps you decide which one is right for your project.
Why Material Choice Matters
The material you choose impacts strength, flexibility, appearance, and even the cost of your final print. For functional prototypes, you might need something durable and heat-resistant. For decorative models, you’ll likely want a smooth finish and a wide range of colours. Making the right choice upfront saves time, money, and frustration.
PLA (Polylactic Acid)
PLA is the most commonly used 3D printing filament and is perfect for beginners. It’s easy to print, affordable, and widely available in multiple colours. However, PLA isn’t very heat-resistant and can deform under stress.
- Best for: Decorative prints, prototypes, hobby projects
- Pros: Easy to print, low cost, biodegradable
- Cons: Lower strength, low heat resistance
PETG (Polyethylene Terephthalate Glycol)
PETG combines the best of both worlds, it’s stronger and more durable than PLA, yet easier to work with than ABS. It’s ideal for prints that need toughness without compromising detail.
- Best for: Functional parts, mechanical components
- Pros: Strong, impact-resistant, water-resistant
- Cons: Slightly trickier to print than PLA, prone to stringing
ABS (Acrylonitrile Butadiene Styrene)
ABS is a professional-grade material known for its strength and temperature resistance. However, it requires higher print temperatures and often a heated enclosure.
- Best for: High-strength parts, automotive components
- Pros: Durable, heat-resistant, widely used in industry
- Cons: Requires controlled environment, emits fumes when printing
Resins
Resin printing offers unmatched detail and surface finish. It’s used for miniatures, jewellery, prototypes, and dental models. However, resin handling requires safety precautions and proper curing.
- Best for: High-detail models, jewellery, miniatures
- Pros: Exceptional detail, smooth finish
- Cons: Messy handling, requires post-curing, higher cost
How to Pick the Right Material for Your Project
Ask yourself these questions:
- Do you need strength or flexibility?
- Will the part be used indoors or outdoors?
- Do you need a smooth, polished finish?
- Is cost or durability more important?
By answering these, you can narrow your material options quickly.
Still Not Sure? Let BritForge3D Help!
If you’re unsure which material is right for your print, BritForge3D can guide you. Simply upload your 3D file, and our team will review your project and recommend the best material for quality, durability, and cost-effectiveness.
Conclusion
Choosing the right 3D printing material is critical to achieving the results you want. Whether you’re experimenting with PLA, working with durable PETG, or exploring the precision of resin, understanding each option gives you the confidence to design and print like a pro. BritForge3D is here to support your journey, one layer at a time.
Troubleshooting Common 3D Printing Issues
A Practical Guide
No matter how advanced your 3D printer is, occasional print failures are inevitable. At BritForge3D, we know how frustrating it can be when a print goes wrong especially after hours of waiting. Whether you’re facing warping, stringing, layer shifts, or adhesion problems, this guide will help you identify and fix the most common issues.
1. Warping: Corners Peeling Off the Bed
Symptoms: The base corners of your print curl up and detach from the bed. Cause: Uneven cooling, poor bed adhesion, or lack of bed heat. Fix: Ensure your heated bed is at the correct temperature, clean the build surface thoroughly, and consider using a brim or raft. Materials like ABS are more prone to warping switch to PLA or use an enclosure if needed.
2. Layer Shifting
Symptoms: The layers appear offset or misaligned during the print. Cause: Loose belts, obstructed axis movement, or overheating stepper motors. Fix: Check that X and Y belts are tight and secure. Make sure your printer’s movement is smooth and unobstructed. If it continues, reduce print speed or enable stepper driver cooling.
3. Stringing (Hairy Prints)
Symptoms: Thin strands of filament appear between parts of the model. Cause: Retraction settings are incorrect or nozzle temperature is too high. Fix: Increase retraction distance and speed in your slicer. Lower the nozzle temperature slightly and enable combing or coasting features.
4. Poor First Layer Adhesion
Symptoms: The first layer doesn’t stick to the bed, leading to print failure. Cause: Bed not level, nozzle too far from bed, or greasy print surface. Fix: Relevel the bed manually or using auto bed leveling. Clean your bed with isopropyl alcohol. Add a skirt or brim in the slicer for extra grip.
5. Under-Extrusion
Symptoms: Gaps in layers, weak walls, or missing print segments. Cause: Clogged nozzle, incorrect extrusion multiplier, or inconsistent filament diameter. Fix: Clean or replace the nozzle, verify filament diameter in the slicer, and calibrate the extruder steps/mm. Use higher-quality filament to prevent inconsistencies.
6. Over-Extrusion
Symptoms: Bulging prints, excess filament, stringing. Cause: Extrusion multiplier set too high or filament not measured correctly. Fix: Lower the extrusion flow rate (usually around 95–100% is ideal). Check filament diameter using calipers and update slicer settings accordingly.
7. Zits and Blobs
Symptoms: Small imperfections or bumps on the outer surface of your prints. Cause: Inconsistent retractions, poorly timed layer changes, or extruder pressure build-up. Fix: Enable “coasting” or “wipe nozzle” options in your slicer. Adjust retraction settings and experiment with “Z-seam alignment” to move start points to less visible areas.
8. Ghosting (Ringing or Echoing)
Symptoms: Echo-like lines appear after sharp corners or features. Cause: Mechanical vibrations or too high print speed. Fix: Reduce print speed and acceleration settings. Ensure your printer is on a solid surface and that belts are tensioned correctly.
9. Brittle or Snapping Filament
Symptoms: Filament breaks before reaching the extruder or while spooling. Cause: Moisture absorption or old filament. Fix: Store filament in a dry box or sealed container with silica gel. For best results, dry it before printing — especially for hygroscopic materials like Nylon or PETG.
10. Still Stuck? Let BritForge3D Help
If you’re troubleshooting a stubborn issue and just can’t find the fix, our team at BritForge3D can help. We’ve handled thousands of prints and know how to diagnose even the trickiest failures. Feel free to contact us or upload your file — we’ll offer guidance or even handle the print professionally for you.
Conclusion
3D printing isn’t just about the machine or the model it’s about understanding the entire process. These common issues are a normal part of the learning curve. With experience (and a little help from BritForge3D, you’ll be producing reliable, high-quality prints in no time. Stay curious, keep experimenting, and don’t let a failed print stop your progress!
The Ultimate Beginner’s Guide to 3D Printing
From File to Finished Part
3D printing is no longer just for industrial designers or engineers. Today, it’s a rapidly growing technology embraced by hobbyists, small businesses, educators, and creators across the world especially in the UK. At BritForge3D, our goal is to make 3D printing accessible, reliable, and valuable for everyone.
Whether you’re brand new to the world of additive manufacturing or considering outsourcing your prints to a local UK-based service, this beginner’s guide will equip you with everything you need to know from downloading your first STL file to holding your finished part in your hand.
What Is 3D Printing?
3D printing, also known as additive manufacturing, is a process where physical objects are created layer-by-layer from digital designs. This contrasts traditional subtractive manufacturing (like carving or milling), where material is removed from a block.
With 3D printing, you can create:
- Prototypes and functional parts
- Artistic models and collectibles
- Medical tools and educational aids
- Customised homeware and gadgets
In short, 3D printing turns digital imagination into real, tangible products quickly and affordably.
Common Types of 3D Printing
There are several different 3D printing technologies, each suited for different applications:
1. FDM (Fused Deposition Modelling)
The most common and beginner-friendly method. A spool of filament (like PLA or PETG) is melted and extruded through a heated nozzle to build an object layer by layer.
2. SLA (Stereolithography)
Uses liquid resin cured by a UV laser. SLA prints offer high detail, often used for jewellery, dentistry, and figurines.
3. SLS (Selective Laser Sintering)
Uses powdered material (usually nylon) fused by a laser. It’s ideal for strong, functional prototypes, often used in industrial settings.
At BritForge3D, we primarily use high-quality FDM and resin systems combining detail, strength, and affordability for UK customers.
What Do You Need to Start 3D Printing?
To print at home, here’s what’s typically required:
| Component | Description |
|---|---|
| 3D Printer | Entry-level models like Bambu Lab or Creality are ideal for beginners. |
| Filament or Resin | PLA is beginner-friendly. Other materials include PETG (stronger), TPU (flexible), and ABS (tougher). |
| Slicer Software | Tools like Cura, PrusaSlicer, or Bambu Studio convert models into printer-readable G-code. |
| Digital Model (STL/3MF) | Download from Thingiverse, Printables, or design your own in Fusion 360 or Tinkercad. |
| Post-processing tools | Sandpaper, cutters, and adhesives for finishing your prints. |
Not ready to invest in equipment? BritForge3D allows you to upload your files and get your prints delivered without buying any hardware.
Step-by-Step: How a 3D Print Is Made
Here’s the full process from concept to completion:
- Find or Create a Model
Download from a trusted STL library or design your own using CAD software. - Slice the Model
Open it in a slicer, adjust settings (layer height, supports, infill), and generate G-code. - Send to Printer
Transfer the G-code to your printer via SD card, USB, or Wi-Fi. - Prepare the Printer
Level the bed, preheat the nozzle and bed, load the filament or resin. - Start the Print
Monitor the first layer to ensure adhesion. First layers are critical! - Let It Finish
Print times vary from 30 mins to 12+ hours depending on size and complexity. - Remove & Clean Up
Remove the model carefully. Trim supports, sand surfaces, or glue parts as needed.
Troubleshooting Common Beginner Mistakes
Starting out can feel frustrating if things don’t go perfectly but most issues are easy to fix:
| Problem | Likely Cause | Fix |
|---|---|---|
| First layer not sticking | Bed not levelled | Re-level bed or use a glue stick |
| Warping | Cold bed, no enclosure | Use heated bed and adjust cooling |
| Stringing | High nozzle temp or retraction issues | Tune temperature and retraction settings |
| Layer shifts | Loose belts or fast speeds | Tighten belts, reduce speed |
| Gaps in walls | Low wall thickness or under-extrusion | Increase wall settings and flow rate |
Comparing Filament Materials
| Material | Strength | Flexibility | Print Ease | Use Cases |
|---|---|---|---|---|
| PLA | Medium | Low | ✅ Very easy | Prototypes, models |
| PETG | High | Medium | ✅ Easy | Enclosures, tools |
| TPU | Medium | ✅ High | ⚠️ Moderate | Gaskets, wearable tech |
| ABS | High | Low | ⚠️ Harder | Functional parts, enclosures |
| Nylon | ✅ Very High | ✅ High | ⚠️ Difficult | Gears, industrial parts |
Why Use BritForge3D?
Many customers in the UK don’t want to invest in their own printers and that’s where BritForge3D excels:
- ✅ UK-Based Faster shipping and support
- ✅ Instant Quotes Upload your STL, get a price via email
- ✅ High-Quality Prints We use industrial-grade printers and expert settings
- ✅ Trusted Service Designed for creators, engineers, and educators
Get A QuoteDon’t risk overseas delays, import costs, or poor results support a UK business that delivers every time.
Upload your file now and get a quote
Final Thoughts
3D printing is one of the most empowering technologies available today. It enables anyone to bring ideas into the real world affordably and quickly. Whether you’re just browsing Thingiverse or planning your own product line, the first step is learning what’s possible.
Don’t forget: you don’t have to print it yourself. BritForge3D can handle the slicing, printing, quality checks, and shipping all from our UK workshop.
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A Technical Guide – Part One
At first glance, 3D printing can seem deceptively simple. You load a file, press print, and a physical object appears. But anyone who has tried to use a printed part in the real world quickly learns that how a part is printed matters just as much as what is printed. Strength, durability, and reliability are all shaped by a small number of key decisions made before the print ever begins.
Among the most important of these decisions are layer height, infill, and print orientation. These settings control how material is laid down, how layers bond together, and how forces travel through the finished part. Understanding how they interact is what separates fragile display pieces from robust, functional components.
This guide is written for readers who want to move beyond beginner assumptions and start thinking like designers and engineers people who want their prints not just to look good, but to work properly.
What Layer Height Really Means
Layer height describes how thick each individual printed layer is. In most desktop FDM printers, this value is measured in millimetres and typically falls somewhere between 0.12 mm and 0.28 mm. While it’s often described as a “quality setting”, layer height influences far more than surface finish.
Smaller layer heights create smoother surfaces and finer detail because the steps between layers are less visible. This is why detailed models and visual parts often use thinner layers. Larger layer heights, on the other hand, reduce print time and can actually improve layer bonding when temperature and flow are set correctly.
It’s important to challenge a common misconception here: thinner layers do not automatically make stronger parts. In fact, thicker layers can sometimes produce stronger results because there is more molten material available to bond each layer together.
With a standard 0.4 mm nozzle, most reliable results are achieved when layer height stays between roughly 25% and 75% of the nozzle diameter. That places the practical range between about 0.16 mm and 0.28 mm. Outside this range, layer bonding and extrusion consistency begin to suffer.
How Layer Height Influences Strength
To understand strength in 3D printing, you need to understand anisotropy. This simply means that printed parts are not equally strong in all directions. The weakest direction is almost always between layers, along the vertical (Z) axis.
Layer height plays a direct role here. Very thin layers increase the number of thermal cycles during a print, which can introduce subtle weaknesses between layers. Thicker layers reduce the total number of layer interfaces and, when printed at the correct temperature, allow stronger fusion between layers.
This does not mean “thicker is always better”, but it does mean that chasing ultra-fine layers for strength is often counterproductive. Strength comes from good bonding, not just visual smoothness.
Understanding Infill from the Inside Out
Infill controls how much material exists inside the part. Rather than printing objects completely solid, most prints use an internal structure to support the outer walls. This saves material, reduces print time, and—when done correctly—maintains strength.
Infill is usually expressed as a percentage, but it’s important not to think of it as a direct measure of strength. A part printed at 30% infill is not “half as strong” as one printed at 60%. In practice, strength increases rapidly at first and then levels off.
For many functional parts, infill values between 20% and 30% are more than sufficient. Higher infill levels add weight and time but often provide diminishing returns unless the part is under extreme load.
Why Infill Pattern Matters
Infill is not just about quantity; it’s also about structure. Different infill patterns distribute forces in different ways.
Patterns such as gyroid and cubic are popular in functional printing because they distribute stress evenly in multiple directions. This makes them well suited for parts that experience complex or unpredictable loads. Simpler patterns like grid print quickly, but they tend to perform poorly under twisting or bending forces.
For most real-world applications, a gyroid or cubic infill at a moderate density offers the best balance between strength, material use, and print time.
Why Wall Thickness Often Matters More Than Infill
One of the most important lessons in functional 3D printing is that outer walls do far more work than internal infill. Walls resist bending, impact, and surface damage, while infill mainly supports the walls from collapsing inward.
A useful rule of thumb is this: adding one extra wall often improves strength more than increasing infill by 20%. This surprises many beginners, but it reflects how forces actually move through printed parts.
For most functional prints, using three to five walls combined with moderate infill produces parts that are both strong and efficient. Increasing the number of top and bottom layers further improves durability, especially for parts under compression or impact.
Print Orientation: Strength Without Changing Settings
Print orientation is one of the most powerful—and most overlooked—tools in strength optimisation. Because layer bonding is weakest between layers, parts are strongest when forces act along the layers rather than across them.
A bracket printed flat can support far more load than the same bracket printed upright. Holes and threads tend to perform better when printed horizontally. Long beams are far stronger when laid flat rather than standing vertically.
In many cases, simply rotating a part in the slicer improves strength more than changing any numerical setting.
Temperature, Cooling, and Layer Bonding
Layer bonding depends heavily on thermal behaviour. If plastic cools too quickly, layers do not fuse properly. If it is printed too cold, the material becomes brittle and weak.
Functional parts often benefit from slightly higher extrusion temperatures and reduced cooling. This allows layers to remain molten long enough to bond effectively. Materials such as PETG, ABS, and ASA are particularly sensitive to cooling, and excessive fan use can dramatically reduce strength.
Even PLA, often printed with high cooling for visual quality, can produce stronger parts when fan speeds are reduced.
Material Choice and Mechanical Behaviour
No amount of tuning can compensate for the wrong material. PLA is stiff and dimensionally accurate, but it is brittle and prone to creep. PETG is tougher and more forgiving. ABS and ASA tolerate heat and impact far better. Nylon offers exceptional strength and fatigue resistance but demands careful moisture control.
Material choice often has a greater impact on real-world performance than infill percentage or layer height. Choosing correctly at this stage prevents failure later.
Knowing When Professional Printing Makes Sense
Some designs demand consistency, precision, and material control that are difficult to achieve reliably on home machines. Parts that must fit accurately, perform under load, or be produced repeatedly benefit from professional printing workflows.
At BritForge3D, prints are optimised for mechanical performance using calibrated machines, proven material profiles, and controlled environments. The goal is not just to make parts look good, but to make them work as intended—every time.
If your part needs to function reliably, not just print successfully, professional support can make all the difference.
Final Thoughts
Understanding layer height, infill, and print orientation changes the way you approach 3D printing. Instead of guessing, you begin making informed decisions that save time, reduce material waste, and dramatically improve performance.
These principles apply whether you are printing at home or working with a professional service. Once mastered, they form the foundation for every successful functional print.
In the next technical guide, we will explore tolerances, shrinkage, and dimensional accuracy—essential knowledge for parts that must fit together precisely.
Guide 1 Summary – The Basics of 3D Printing
This guide introduced the fundamental process behind 3D printing, from digital model to finished physical part. By understanding how slicing, layer formation, and material deposition work together, you can begin to see why certain print decisions matter more than others.
Rather than treating 3D printing as a black box, this guide encourages you to think of it as a controlled manufacturing process. Once you understand how layers are created and bonded, settings such as orientation, material choice, and strength optimisation start to make sense.
In the next guide, we build on this foundation by exploring how layer height, infill, and internal structure influence the strength and reliability of printed parts.
A Technical Guide – Part Two
Understanding Tolerances in 3D Printing
One of the most important concepts to understand in 3D printing is that printed parts are never exact copies of their digital designs. This can be surprising at first, especially for people coming from traditional manufacturing or CAD backgrounds. On screen, a model appears perfect and precise. In reality, the printed result is always an approximation — and that’s completely normal.
The way we manage this approximation is through tolerances. A tolerance is simply an accepted range of variation between parts that are meant to fit together. Rather than expecting absolute accuracy, designers allow for small differences so components can still assemble and function correctly.
In traditional manufacturing methods such as machining, tolerances can be extremely tight because material is removed in a controlled, predictable way. In 3D printing, parts are built layer by layer from molten plastic. This introduces more variability, which means tolerances must be wider to remain realistic and reliable.
Several factors contribute to this variation. Each layer is placed individually, material flow can vary slightly from one moment to the next, plastic contracts as it cools, and even a well-maintained machine has mechanical limits. Because of this, designing without tolerance allowances is one of the most common causes of failed assemblies in 3D printing.
For most FDM printers, a realistic expectation is accuracy within about two tenths of a millimetre for general-purpose parts. Well-tuned machines can sometimes achieve tighter results, but designing around ideal conditions rather than typical ones often leads to frustration. Good design is about predictability, not perfection.
Why Holes Almost Always Print Smaller
A classic example of tolerance issues appears with holes. If you design a hole at a specific diameter, it will almost always print slightly smaller than expected. This behaviour is not a printer fault — it’s a natural outcome of the printing process.
As the nozzle moves in a circular path, molten plastic tends to curve inward rather than forming a perfect circle. Layer stacking adds a stepped edge to what should be a smooth surface, and cooling causes the material to contract slightly. When these effects combine, the final hole ends up undersized.
Because this behaviour is consistent, it can be designed around. A practical approach is to increase hole diameters in the design stage, typically by two to four tenths of a millimetre. For example, a hole intended for a 5 mm bolt may be designed closer to 5.3 or 5.4 mm to ensure reliable fit after printing.
For applications where precision really matters, post-processing is often the best solution. Drilling or reaming printed holes removes variability and produces clean, accurate results that are difficult to achieve through printing alone.
Shrinkage: Why Parts Change Size as They Cool
Shrinkage is another unavoidable aspect of 3D printing. When plastic is heated and then allowed to cool, it contracts. Different materials shrink at different rates, which is why the same design can behave very differently depending on the filament used.
PLA is one of the most dimensionally stable materials and tends to shrink very little, which is why it prints so predictably. PETG shrinks slightly more but compensates by being more flexible, reducing the risk of cracking. ABS, ASA, and nylon shrink significantly more and are far more sensitive to cooling conditions, which is why enclosures and controlled environments are often required.
Shrinkage affects more than just overall size. It influences flatness, causes warping, and distorts holes and mating surfaces. This is why material choice plays such a critical role in dimensional accuracy. Choosing the wrong material can introduce accuracy issues that no amount of slicer tuning will fully correct.
How Print Orientation Affects Accuracy
Accuracy in 3D printing is not uniform in all directions. The printer controls movement in the horizontal directions using motors and belts, which are generally very precise. Vertical movement, however, is governed by layer height, which limits resolution in that direction.
As a result, parts tend to be more accurate in the horizontal plane than in the vertical one. Vertical holes are often less accurate than horizontal holes. Tall, thin parts can drift slightly as layers accumulate, and changes in layer height directly affect vertical resolution.
For parts where accuracy is critical, orienting important surfaces in the horizontal plane often produces better results. This does not eliminate the need for tolerances, but it does reduce variability.
Layer Height and Dimensional Control
Layer height plays an important role in how accurately features are reproduced, particularly in the vertical direction. Smaller layer heights improve resolution and produce smoother mating surfaces, while larger layer heights exaggerate the stepped nature of the print.
For parts where fit matters, consistency is more important than ultra-fine detail. Moderate layer heights tend to produce more predictable results, especially when combined with sufficient top and bottom layers. Adaptive layer height can be useful, but only after careful testing, as it introduces additional variability.
Calibration: The Hidden Foundation of Accuracy
No amount of clever design can compensate for a poorly calibrated printer. Dimensional accuracy begins with consistent extrusion, stable motion, and reliable bed positioning.
Extrusion accuracy ensures that the correct amount of material is deposited. Belt tension affects positional accuracy in the horizontal plane. Bed leveling and Z-offset determine how accurately the first layer sets the foundation for the entire print. Advanced features such as pressure advance help manage material flow during acceleration and deceleration.
At BritForge3D, printers are routinely calibrated and verified to ensure that parts behave predictably across multiple prints. This consistency is essential for professional prototyping and repeat production.
Designing for Fit: Clearance as a Design Tool
Rather than trying to eliminate variation, experienced designers use clearance intentionally. Clearance is the space between mating parts that allows for assembly after printing.
Loose fits allow parts to move freely. Sliding fits enable controlled movement. Snug fits hold parts in place without force. Press fits require testing and careful iteration. These categories are not fixed rules, but starting points that must be validated through prototypes.
Fit-critical parts should always be tested before final production. Small changes in clearance can dramatically change how a part behaves.
Threads, Inserts, and Reliable Fastening
Printed threads can work, but they have limitations. Coarse threads perform better than fine ones, and orientation matters greatly for strength. For assemblies that will be taken apart repeatedly, printed threads are rarely the best solution.
Heat-set inserts provide a far more durable alternative. Installed correctly, they create strong metal threads within printed parts, allowing repeated assembly without wear. Designing for inserts requires careful attention to hole size and installation temperature, but the improvement in reliability is significant.
When Precision Truly Matters
Some projects demand tighter control than most home printers can reliably provide. Mechanical assemblies, snap-fit enclosures, replacement parts, and engineering prototypes often fall into this category.
This is where a professional print service adds real value. At BritForge3D, tolerances are adjusted per material, critical components are test-fit, and print orientation is chosen specifically to maximise accuracy. The result is consistent, dependable production for customers across the UK.
Final Thoughts
Dimensional accuracy in 3D printing is not about achieving perfection. It is about achieving predictability. Once you understand how tolerances, shrinkage, orientation, and calibration interact, you can design parts that fit first time and perform exactly as intended.
In the next technical guide, we will explore heat resistance, load, and long-term durability — essential knowledge for parts designed to survive real-world use.
Guide 2 Summary – Layer Height, Infill, and Strength
In this guide, we explored how strength in 3D printing is created internally rather than through surface appearance alone. You learned why thicker walls often matter more than high infill, why thinner layers are not always stronger, and how print orientation can dramatically affect performance.
The key takeaway is that strength comes from balance. Smart combinations of layer height, wall thickness, infill, and orientation produce better results than extreme settings in any single area.
The next guide focuses on one of the most common challenges in functional printing: understanding tolerances, shrinkage, and why parts do not always fit together as expected.
A Technical Guide – Part Three
Heat Resistance, Load, and Long-Term Durability in 3D Printed Parts
A common assumption in 3D printing is that if a part feels strong when it comes off the printer, it will remain strong in use. In reality, many printed parts fail not because they were overloaded, but because they were exposed to heat or stress over time. Understanding durability means thinking beyond initial strength and considering how materials behave in real-world conditions.
Heat plays a critical role in plastic performance. Most plastics do not need to reach their melting point to fail. Instead, they gradually soften as they approach their heat deflection temperature. At this point, a part may still look intact but can no longer support load without deforming.
PLA is a good example. While it is stiff and strong at room temperature, it softens at relatively low heat. This is why PLA parts often warp inside cars, near electronics, or in warm environments. The part has not melted; it has simply lost its ability to resist deformation.
Load introduces another dimension to durability. When a part carries weight continuously, it experiences stress even if that stress is well below its breaking strength. Over time, this can lead to creep, which is slow, permanent deformation. PLA is particularly prone to creep, which is why it is unsuitable for long-term load-bearing parts.
PETG behaves differently. Its slight flexibility allows it to absorb stress rather than concentrating it in one place. This makes PETG far more resistant to cracking and long-term deformation under moderate loads. However, this flexibility can also be a disadvantage where rigidity is required.
ABS and ASA are designed for harsher conditions. They maintain their shape at higher temperatures and resist impact better than PLA or PETG. ASA adds UV resistance, making it suitable for outdoor use where sunlight would otherwise degrade the material.
Nylon takes durability further still. It excels under repeated stress, vibration, and impact. Nylon parts often bend rather than break, making them ideal for mechanical components. However, nylon’s performance depends heavily on moisture control, as absorbed water changes its mechanical behaviour.
Durability is also influenced by geometry. Sharp corners concentrate stress, while smooth transitions distribute it. Thin sections heat and cool faster than thick ones, which can introduce internal stress. These factors all affect how a part ages over time.
Print orientation plays a major role as well. Loads applied across layer lines exploit the weakest direction in FDM printing. Orienting parts so that stress runs along the layers dramatically improves durability without changing material or settings.
Environmental exposure must also be considered. UV light, moisture, chemicals, and temperature cycling all degrade plastics differently. A part designed for indoor use may fail quickly outdoors if material choice is not adjusted.
Durability, therefore, is not a single property. It is the result of material choice, geometry, orientation, and environment working together. Ignoring any one of these factors invites failure.
Professional printing workflows consider durability from the start. At BritForge3D, parts are evaluated not just for print success, but for how they will perform weeks, months, and years after installation.
Understanding long-term behaviour allows designers to avoid surprises and create parts that remain reliable throughout their service life.
Guide 3 Summary – Tolerances and Dimensional Accuracy
This guide explained why printed parts are never exact replicas of their digital designs and why this is not a flaw, but a characteristic of the process. By understanding tolerances, shrinkage, and orientation-related accuracy, you can design parts that fit reliably instead of relying on trial and error.
You learned that dimensional accuracy is about predictability, not perfection. Once variation is understood and planned for, assembly issues become far less common.
In the next guide, we move beyond fit and focus on how printed parts behave over time, exploring heat resistance, load, and long-term durability.