Thingiverse.com is the ultimate free 3D printing library, and most files are optimized for 3D printing. Thangs.com is a 3D print model search engine with both free and paid models and is another great resource for discovering 3D files.
To start creating your own designs or to modify a deign you found online, we recommend starting with Tinkercad, but Adobe Illustrator and Shapr3D are also good.
Most .png or .jpg images can be used with the CutStudio software. Ready-made designs optimized for vinyl cutting can be found on Google or Pinterest by searching "svg cut files."
Ponoko.com/free-laser-cutting-files-templates features free project files that can be imported and edited in Adobe Illustrator.
Embroideres.com/free-embroidery-designs offers an index of free ready-to-use embroidery files.