Designing for 3D printing is different from designing for injection moulding or CNC. Avoiding these common pitfalls will save you time and frustration.

1. Ignoring Wall Thickness

Thin walls can warp, break, or fail to print. We recommend a minimum of 1.2 mm for FDM and 0.8 mm for resin printing.

2. Overusing Overhangs

Angles above 45° will require support, which affects surface quality and increases post-processing.

3. Not Considering Orientation

Layer orientation affects strength. Consider the direction of stress on functional parts.

4. Forgetting Tolerances

For parts that need to fit together, leave a clearance of at least 0.2 mm for FDM printing.

5. Overcomplicating Features

Simplify your design for faster printing and fewer issues. Avoid unnecessary fine detail unless using resin.

Need design help? Contact BritForge 3D and we’ll review your model.

One of the best things about 3D printing is the incredible number of free models you can download and print no design experience needed! Whether you’re looking for practical tools, fun gadgets, miniatures, or educational models, these five websites are go-to sources. At BritForge 3D, we work with all of them and can help you bring any downloaded model to life with professional-quality results.

1. Printables by Prusa

Printables.com is a rapidly growing model-sharing platform from Prusa Research. It’s 100% free and features high-quality STL files from trusted creators. You can browse by category or popularity, and most listings come with print settings and tips.

• ✅ Great for functional prints and hobby projects
• ✅ Active community with frequent competitions
• ✅ No account needed to download

2. Thingiverse

Thingiverse is the original 3D model hub with thousands of files. It’s great for finding creative or educational prints, although quality varies since anyone can upload files.

• ✅ Massive variety of models
• ✅ Ideal for schools and hobbyists
• ⚠️ Check printability before ordering

3. MyMiniFactory

MyMiniFactory is known for professionally curated models and supports many independent designers. It’s especially good for gaming figures, props, and premium-quality designs. Many are free, but some are paid.

• ✅ Excellent for miniatures and cosplay items
• ✅ Filters by licence and printer type
• ✅ Print-ready files with instructions

4. Cults3D

Cults3D is a French-based platform with a creative and artistic twist. You’ll find unique home decor, jewellery, and design-focused models. Some files are free, and others require a small fee.

• ✅ Great for creative and niche projects
• ✅ Many free and high-resolution files
• ⚠️ Mixed file licensing, check before commercial use

5. NASA 3D Resources

NASA 3D Resources offers a curated collection of space-related models, including spacecraft, rovers, and planets all in the public domain. It’s a fantastic tool for educators and STEM outreach.

• ✅ Educational and scientifically accurate
• ✅ Free and public domain
• ✅ Perfect for schools and museums

Tips for Downloading Printable Models

• Always check the file type (.STL, .OBJ, etc.)
• Look for “print-ready” or “tested” labels
• Check model scale and orientation
• Use slicing software like Cura to preview before printing

Print Your Files with BritForge 3D

Once you’ve downloaded your model, simply upload it to BritForge 3D. We’ll review it, suggest the best material, and provide instant pricing. Whether you’re printing a rocket, a phone stand, or a full chess set, we’ll deliver precise, high-quality results all made in the UK.

Conclusion

With thousands of free 3D models available online, the only limit is your imagination. Explore, download, and start printing and let BritForge 3D handle the hard part for you. No printer? No problem.