Around the world, there are people who have lost all or part of their hand, or were born without one. There are also people and institutions with 3D printers. Pair the two, and you can print a custom mechanical hand for $20-150 — thousands less than the typical prosthetic. e-NABLE, which functions through a website, Facebook page and Google+ page, stepped up to connect the two after site founder Jon Schull came across work by American prop maker Ivan Owen, who made a metal mechanical hand for South African carpenter Richard Van As.