A company called Youbionic is working on creating a 3D printed bionic hand that operates using muscle sensors, an adrduino, and motors. It is completely 3D printed in one piece, unlike other 3d printed prosthetics. While no price has been set as of yet, it is expected that it will be priced in the hundreds of dollars range. Read more about this hand at http://3dprint.com/9294/youbionic-3d...d-bionic-hand/