Keycap STLs or Fusion 360 files

Are STL files (or Fusion 360 files) available to 3D print up custom keycaps? I just go my Model 100. I am suspicious that this will be more of a learning curve for me that I want. Specifically, I don’t think I can train my thumbs to stay on one tiny single cap for a space bar. I was considering printing up double size caps for the thumb buttons to turn them into “two” buttons on each side. I’d also like to possibly re-organize some of the existing functions, and might like to print up my own keycaps.