robotic or prosthetic hand

Robotic hand, inspired by the Mecha hand.

The complete hand stl is just for letting you know how it looks.
The finger exploded view is just a guide for assembly.
By using rubber bands the fingers will extend after releasing them when they were flexed.

Maybe you also like http://www.thingiverse.com/thing:2171811 same principle but servo powerd. Almost the same setup, just need some extra parts to be printed