3D Printing a finger prosthesis
To start with, this assumes you know something about 3D printing – I’m not equipped to teach you everything on that topic. However – I got started with it specifically for this reason, and others have followed – so if you have interest and the means to get started, I encourage it and can try to help if you get stuck.
Print items slowly and at best accuracy your printer can, it’s worth it to get things fitting together best.
I use Simplify3D, and print everything with supports, 0.1mm layers, 80% infill, 4 layers on top and bottom, 3 on sides, at 20mm/s.
I use PLA for the hard items – the two knuckles, middle section, and linkage. In this example, I used http://www.amazon.com/gp/product/B00GTY3Z9E
Use something flexible for the socket, tip cover, hinge plugs, and bumper. In this case I used elastic TPU: http://www.amazon.com/gp/product/B00TI3JUSI
Another good option is Ninjaflex: http://www.amazon.com/gp/product/B00HSEWKSQ