The Shapeoko wiki listed some:
- Open Designs - Obrary
- http://cncfilesharing.com/ [New file sharing group started up - #3 by orlrobinson]
- http://libre3d.com
- https://pinshape.com/
- http://www.3dcontentcentral.com/
- http://paperhouses.co/
- https://akerkits.com/ — gardening files
- https://www.freepatternsarea.com/
- Free DXF Files and CNC Patterns Your Can Cut Today [ 100's ]
- https://grabcad.com/
- https://library.zortrax.com/
- http://pileprint.com/ — Spanish?
- https://repables.com/
- PARTcloud - PARTcommunity - 3D & 2D CAD Models — app available
- https://free3d.com/
- http://www.cncriver.com/
Sites added from discussion below:
Parametric sites using OpenSCAD
Vintage plan repositories
- http://www.vintageprojects.com/
- The Woodcrafter Page, Free Woodcrafting Plans - Free Woodworking plans retro delta.
- http://www.packratworkshop.com/lib12.htm
- https://dxfprojects.com/home
- http://www.aircorpslibrary.com/ [https://www.reddit.com/r/cad/comments/fsr3g2/cad_project_ideas_for_students_while_teaching/fm34b9e/]
3D model sources
http://reprap.org/wiki/Printable_part_sources
- http://www.vectorclip3d.com/
- https://www.vectorart3d.com/
- http://hobbycncart.com/ — link reported as dead.[New file sharing group started up - #9 by Griff]
- http://www.3dmodelclub.com/
- http://carver3d.com/en/
- http://3dprint.nih.gov/
- Models | 3D Resources GitHub - nasa/NASA-3D-Resources: Here you'll find a growing collection of 3D models, textures, and images from inside NASA. [https://www.reddit.com/r/3Dprinting/comments/5bzc0i/nasa_puts_its_3d_models_up_on_github/]
- http://open3dmodel.com/ [FidgetTheMidget comments on Where do people get their 3D models from (STL files etc)?]
- https://free3d.com/ [FidgetTheMidget comments on Where do people get their 3D models from (STL files etc)?]
- Download the best free 3D printer designs of Tools for DIY・Cults [FidgetTheMidget comments on Where do people get their 3D models from (STL files etc)?]
- https://africanfossils.org/
- http://www.3dcontentcentral.com/
- http://www.embodi3d.com/ — free library of anatomic and biological models
- http://www.3dwave.org/ [STL High Quality Files]
- Open-source 3D models - Sketchfab
Commercial Project Sites
- https://aribabox.com/
- https://www.cgtrader.com
- http://www.designandmake.com/
- https://www.myminifactory.com/ — free and paid models
- https://www.redpah.com/
- https://cults3d.com/
- https://www.designshop.com/
- https://www.modifile.com/
- http://3axis.co/ [https://www.reddit.com/r/CNC/comments/esllur/free_cnc_routershaper_origin_project_files/ffb1960/]
- https://www.pixelstoprototype.com/post/free-cnc-project-files