I am making a 3d printed knitting machine.
Here is a link to the files: https://www.thingiverse.com/thing:469...
Credit to Mr Roboto 19 (Steve Turner) YouTube channel:    / @steveturner1447  
My Book is called: Making Handmade Shoes - A Step By Step Guide and is available on Amazon USA, UK, Germany, Spain, Italy, Netherlands, Poland, Sweden and Canada.