This report surveys sources, formats, legal considerations, quality factors, and workflows for obtaining and using free relief files compatible with ArtCAM-style CNC relief carving software. It aims to help hobbyists, small shops, and educators find usable assets, understand what to watch for, and integrate free reliefs into production workflows while remaining compliant with licensing and technical constraints.
Since you can't save native .ART files in the old 2013 version easily: free artcam relief files
Instead of seeking “free ArtCAM reliefs” directly, search for “free CNC relief STL” or “heightmap for CNC” and import those into ArtCAM. That opens up thousands of legal, high-quality models from community repositories. 3D model marketplaces with free sections
If you need a real paper for school or publication, I strongly suggest you: Dedicated relief and CNC communities
Below are categories of sources and representative examples (note: availability and terms can change; always check current licensing before use).