Prosthetic limbs traditionally cost many thousands of dollars, doubling the pain of people who have already suffered enough. But several projects are showing how it’s possible to produce artificial arms and legs for less. A while ago, we wrote about a couple of guys who got together over the Internet to build themselves a bionic hand from Meccano and an Erector Set. It wasn’t pretty–but it was effective, and the two have since gone on to set up their company. Then, there was Pinchy–an arm made by two seniors at Rose-Hulman Institute of Technology. Now comes another project, this time from Alabama. Zero Point Frontiers, an engineering company in Huntsville, has built a simple plastic hand, using nothing more than a MakerBot 3D printer. A two-year-old named Kate Berkholtz, who was born without fingers because of a congenital abnormality, is using the device.