Mish Shedlock has a post on creating artificial hands with 3D printers - Need a Hand? Boy Gets Prosthetic Hand Made by 3-D Printer (Cost $5 vs. $30K Medical Device).
What do you do when you cannot afford a $30,000 prosthetic hand that your son needs?
Two years ago, Paul McCarthy began searching for an inexpensive yet functional prosthetic hand for his son Leon, who was born without fingers on one of his hands. McCarthy came across a video online with detailed instruction on how to use a 3-D printer to make a prosthetic hand for his son. McCarthy made a prosthetic hand for his son for a cost of $5 and free time on a 3D printer.