A Beginner’s Guide

Not every 3D model is ready for the printer. Whether you download it from Thingiverse or model it yourself, here’s what to check before printing.

1. Watertight (Manifold) Geometry

Your model must be a single, closed mesh with no gaps or loose surfaces.

2. No Non-Manifold Edges

These confusing edges can’t exist in the real world and will confuse the slicer.

3. Scaled Correctly

Make sure the dimensions make sense especially if your file was exported in inches but imported in millimetres!

4. Clean Mesh

Use tools like Netfabb or Meshmixer to clean and repair geometry.

Still unsure? Upload your file to BritForge3D.co.uk and we’ll check it for free before printing.

3D printed parts are anisotropic, meaning their strength varies depending on direction. Understanding this concept is critical for engineering-grade parts.

What Is Anisotropy?

Unlike injection-moulded parts, 3D prints have directional strength:

• X/Y plane: strongest
• Z axis: weakest (layer adhesion)

Ignoring anisotropy leads to unexpected failures.

Designing With the Load Path

Always align your print so the load path runs parallel to layers, not across them.

Examples:

• Brackets should lie flat
• Hooks should print sideways
• Shafts should not be printed upright

Using Geometry to Improve Strength

Strength isn’t just about settings geometry matters.

Effective design features:

• Fillets instead of sharp corners
• Ribs instead of solid blocks
• Gradual transitions in thickness
• Hollow structures with thick walls

These reduce stress concentration and improve performance.

Support vs Strength Trade-Offs

Reorienting for strength sometimes requires more support material.

Tips:

• Accept supports if strength improves
• Remove supports carefully to avoid scars
• Consider splitting and bonding parts

Professional Print Strategy

At BritForge3D, orientation is selected based on:

• Load direction
• Surface finish requirements
• Post-processing needs
• Material behaviour

Get expert orientation applied automatically when you upload your file.

A Simple Guide

Before you print, you need the right file format. Not all 3D design files are created equal and some work better than others for printing.

Most Common 3D Printable File Types

• STL – The most universal format for 3D printing. Widely supported and ideal for simple shapes.
• OBJ – Includes color and texture data. Best for artistic models or miniatures.
• 3MF – A modern format with more metadata and better slicing support.

When to Use Each File Type

If you’re designing in Fusion 360, Tinkercad, or Blender, export as STL unless your project requires materials or textures.

Need help converting a file? We’re happy to assist before printing!

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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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One of the most important decisions you’ll make when starting a 3D printing project is choosing the right material. Whether you’re printing a prototype, a mechanical part, or a piece of art, the filament or resin you choose can affect the strength, appearance, and success of your final product.

Why Material Choice Matters in 3D Printing

Every material used in 3D printing has its own set of properties from strength and flexibility to heat resistance and surface finish. Choosing the wrong material can lead to failed prints, brittle parts, or unnecessary expense. Understanding the differences between materials helps ensure you get the best results based on your application.

Overview of Common 3D Printing Materials

• PLA (Polylactic Acid): Easy to print and biodegradable. Ideal for general-purpose prints and prototypes.
• PETG (Polyethylene Terephthalate Glycol): Stronger and more durable than PLA. Great for functional parts.
• ABS (Acrylonitrile Butadiene Styrene): Impact-resistant and heat-tolerant. Used in engineering and manufacturing.
• TPU (Thermoplastic Polyurethane): Flexible and rubber-like. Suitable for phone cases, seals, and wearables.

When to Choose PLA

PLA is perfect for beginners or those creating visual models. It’s affordable, available in a wide range of colours, and prints without warping. However, it’s not the best choice for parts exposed to high heat or mechanical stress.

When to Choose PETG

PETG is ideal for durable parts that need to resist stress or moisture. It offers a good balance between strength and flexibility and is commonly used in mechanical assemblies, tool handles, and enclosures. PETG also has a glossy finish and better UV resistance than PLA.

When to Choose ABS

ABS is known for its high durability and heat resistance. It’s used in automotive components, functional prototypes, and casings. However, it requires a heated print bed and enclosed chamber to prevent warping, and it emits fumes, so good ventilation is essential.

When to Choose TPU or Specialty Filaments

TPU is a flexible filament often used for protective gear, phone cases, and gaskets. Specialty filaments such as carbon fibre, wood-infused, or glow-in-the-dark PLA offer additional features but may require tuning print settings or a hardened nozzle.

Material Comparison Table

Material	Strength	Flexibility	Print Difficulty	Use Case
PLA	Moderate	Low	Easy	Prototypes, models
PETG	High	Moderate	Medium	Functional parts
ABS	High	Low	Difficult	Engineering, industrial
TPU	Moderate	High	Medium	Flexible parts

Tips for Choosing the Right Material

• Match material strength and durability to the intended use
• Consider the environment heat, moisture, UV exposure
• Think about flexibility or rigidity as needed
• Balance aesthetics vs. functionality
• Ask for advice if unsure experienced printers can help

How BritForge 3D Can Help

At BritForge 3D, we work with a wide range of materials to suit every project. Whether you’re printing a quick prototype or a batch of custom parts, we help you select the right filament based on your goals, budget, and design needs.

Our experts are happy to recommend the best option for your file. Simply upload your model or contact us for a free consultation.

Conclusion

Choosing the right material is critical to the success of your 3D print. With options like PLA, PETG, ABS, and TPU, there’s a perfect filament for every job and BritForge 3D is here to help you find it. Let us bring your ideas to life with the right balance of strength, detail, and value.

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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

Ordering a 3D print online has never been easier, especially with services like BritForge 3D that let you upload your model, receive an instant quote, and choose your material all in just a few clicks. This guide walks you through the full process so you can get your custom part printed and delivered with confidence.

Step 1: Prepare Your 3D Model

The most common file formats for 3D printing are .STL and .OBJ. Make sure your file is watertight (manifold), properly scaled in millimetres, and error-free. Free tools like Microsoft 3D Builder or Meshmixer can help repair your model if needed.

Step 2: Visit the Upload Page

Go to the BritForge 3D upload page. There, you’ll see a form where you can drag and drop your file. Our system automatically checks it and displays a live quote based on volume, material, and quantity.

Step 3: Choose Material and Options

You’ll be prompted to choose your material options typically include PLA, PETG, ABS, or resin. You can also select print resolution, colour, and whether you want supports removed and parts post-processed (sanded or cleaned).

Step 4: Get Instant Pricing

Once your file is uploaded and options selected, you’ll receive a price instantly. This saves time compared to manual quote requests and gives you transparency over costs.

Step 5: Checkout and Payment

Review your order and proceed to secure checkout. Payments can be made via card, PayPal, or other supported methods. You’ll receive a confirmation email with an estimated delivery timeline.

Step 6: Sit Back While We Print

Your file is queued for printing in our UK-based workshop. We keep you updated throughout the process, and once completed, your part is shipped securely to your door.

Why Order from BritForge 3D?

• Instant online quoting
• Expert print review and guidance
• UK-based production for faster delivery
• Resin and FDM options with high accuracy

Tips for Better Prints

• Check wall thickness minimum 1.2 mm for most parts
• Avoid unnecessary overhangs to reduce support use
• Indicate critical dimensions in your message if needed

Need Help?

If you’re not sure which material to choose or need help fixing your file, contact Us and we’ll guide you through it.

Start your project today: Upload your 3D file now and get your custom part printed with care and precision by BritForge 3D.

How Schools and Colleges Can Benefit

3D printing is transforming education across the UK. From primary classrooms to university engineering labs, this technology allows students to bring their ideas to life developing critical thinking, creativity, and real-world problem-solving skills.
At BritForge 3D, we’re proud to support schools, colleges, and educators with high-quality, affordable printing services that bring learning to life.

Why 3D Printing Belongs in the Classroom

3D printing introduces students to the world of design, engineering, and technology in a hands-on, engaging way. Instead of just learning theory, students can prototype, test, and iterate just like professional engineers and designers do.

Educational Benefits of 3D Printing

• Hands-on STEM Learning: Print real-world models to support science, maths, engineering and technology education.
• Encourages Creativity: Students can design and build original projects that they can physically hold and evaluate.
• Bridges Digital and Physical: Teach CAD, design thinking, and prototyping skills with instant physical results.
• Boosts Engagement: Interactive learning that appeals to visual and kinesthetic learners.

Popular 3D Printing Projects for Schools

• Working mechanical gear systems
• Topographic maps and historical models
• Biology models: cells, bones, organs
• Custom tools or classroom organisers
• STEM club competitions and creative design challenges

Supporting the UK Curriculum

3D printing aligns well with the UK’s national curriculum, especially in Design and Technology, Science, and Computing. Students gain digital literacy and problem-solving skills that prepare them for careers in engineering, architecture, product design, and more.

Why Schools Choose BritForge 3D

• Cost-effective printing with bulk education discounts
• Print-ready help and model checking
• Support for both PLA and resin models
• Custom packaging and quick UK delivery

No Printer? No Problem!

You don’t need an expensive school 3D printer. With BritForge 3D, teachers can upload STL files and have models delivered to the school within days ideal for small or large classroom projects.

How to Get Started

If you’re an educator or school leader interested in adding 3D printing to your teaching toolkit, get in touch with us. We’ll help you choose materials, set expectations, and ensure your project fits your classroom goals and budget.

Conclusion

3D printing in education opens the door to interactive, future-ready learning. With expert support and reliable service from BritForge 3D, you can inspire students, reinforce key concepts, and make lessons more engaging one layer at a time.

Why It Matters

When it comes to 3D printing, infill plays a critical role in determining the strength, weight, cost, and print time of your object. Whether you’re printing a functional prototype or a decorative model, understanding infill can help you make smarter design and material choices. At BritForge 3D, we optimise every print to meet your needs and infill is a key part of that process.

What Is Infill?

Infill refers to the internal structure of a 3D printed object. Instead of printing a solid block, most parts are printed with an internal pattern that gives them strength while saving material. The outer shell (or perimeter) is printed solid, while the inside is partially hollow filled with a repeating pattern called infill.

Why Infill Matters

• Strength: More infill = stronger part
• Weight: Less infill = lighter part
• Print Time: Higher infill increases time and cost
• Purpose: Match infill to function (display vs. functional)

Common Infill Patterns

• Grid: Balanced strength and speed. Good for most parts.
• Gyroid: Excellent strength in all directions and efficient material use.
• Honeycomb: Lightweight with moderate strength. Popular for visual appeal.
• Lines: Fastest to print, used for basic prototypes.

Recommended Infill Percentages

Use Case	Infill Percentage	Notes
Display Model	10–15%	Light and fast to print
Functional Part	25–50%	Stronger, better durability
Structural Load-Bearing	50–100%	Max strength, longer print time

How Infill Affects Cost

Higher infill means more material and longer print times which increases the cost. For example, changing from 15% to 50% infill might double the amount of filament used. At BritForge 3D, we help you choose the best balance of strength and budget for your application.

Infill Tips

• Use low infill for decorative or non-functional models
• Choose gyroid or grid for strength and reliability
• Keep in mind that more infill doesn’t always equal better results
• Use multiple perimeters instead of just increasing infill

How BritForge 3D Optimises Infill

We analyse every print job to recommend an ideal infill percentage and pattern based on use, strength, and cost. Whether you’re printing a bracket, toy, or prototype, we tailor each print to perform as needed saving you time and money.

Conclusion

Infill is more than just a setting it’s the backbone of your 3D printed part. Understanding how it works helps you make better decisions, whether you’re designing a prototype or ordering your first custom part. Let BritForge 3D help you find the perfect infill for your next project.

Print orientation is one of the most important yet often overlooked aspects of successful 3D printing. How a part is positioned on the print bed affects not only how it looks but also how strong it is in real-world use. At BritForge 3D, we evaluate each model to ensure it’s oriented for the best balance of strength, accuracy, and surface finish.

What Is Print Orientation?

Print orientation refers to how your 3D model is positioned during the printing process. This determines how layers are built up, how supports are generated, and how forces act on the finished part.

Why Print Orientation Matters

• Part Strength: FDM prints are weakest between layers. Orient your part to resist stress across layers.
• Surface Finish: Vertical surfaces print smoother than horizontal overhangs.
• Print Time & Supports: Orientation affects how much support material is required and how long a print takes.
• Accuracy: Flat surfaces on the print bed come out cleaner and more dimensionally accurate.

Layer Adhesion and Strength

In FDM 3D printing, parts are built layer by layer. The bond between layers isn’t as strong as the material itself, which means parts can be prone to delamination under stress especially if printed in the wrong orientation. For maximum strength, orient parts so the load is parallel to the layers.

Examples of Optimal Orientation

• Brackets: Print with the flat face on the bed and the arms upright to handle load across the layer lines.
• Hinges or Clips: Align so stress points run along, not between, layers.
• Decorative Models: Choose orientation for better detail visibility and smooth surfaces.

Support Material Considerations

Changing orientation can dramatically reduce the need for supports saving time and material. Parts printed with minimal overhangs are easier to post-process and have a better finish.

Tips for Better Print Orientation

• Minimise large overhangs (greater than 45°)
• Orient parts with the flattest side down for bed adhesion
• Consider the functional load design for it!
• Use preview features in slicing software to evaluate orientation

How BritForge 3D Helps

When you upload a file to BritForge 3D, we assess print orientation to ensure it meets your needs. Whether you’re making a working part or a display model, we tweak orientation, supports, and slicing settings to optimise every job.

Conclusion

Understanding how orientation affects 3D printed part strength can be the difference between success and failure. Our team at BritForge 3D takes the guesswork out delivering durable, high-quality prints designed for real-world performance.