$200 Prosthetic Arm Made With 3D Printer (video included)
A trio of biomedical engineering students at the Washington University in St. Louis (WUSTL) managed to build a 13-year-old girl a robotic prosthetic arm using a 3-D printer. Incredibly, the robotic arm cost a meager $200 to make; normally a prosthetic would set you back a minimum of $6,000.
http://www.iflscience.com/technology/students-use-3-d-printer-produce-prosthetic-arm-200#Cj7V6i7mL4m8XF6E.30