The Derek Arm is an elbow-actuated variant of an RIT-developed e-NABLE prosthesis designed to fit Derek, the first user of our arm.  As illustrated below, in the video, bending the elbow causes the fingers to flex by tightening strings descending from the fingers to tensioners in the upper arm.http://www.youtube.com/watch?v=T9nngOrdPkg The "Documents" tab contains STL and Inventor files. *Start by reading the ReleaseNotes at: http://bit.ly/1nUJ647 Readme at: https://docs.google.com/a/g.rit.edu/document/d/1uEomoBOTEfTNRHCYmNr_5AkKPJv8TYJSbxhE4p5BYU8/edit