Take a look at this :
This is the humming bird robotic kit.
Maybe is the sort of thing you would like to know. The logic is almost the same: "muscles" being operated by a computer.
http://www.hummingbirdkit.com/learning/making-robot-hand-hummingbird
Ok now I wanna try that. Hands would be a really nice starter coarse. Print out each one of the phalanges. Place the kit along the 3D printed bones and then make a hand skin prosthetic over top somehow- to hide the wires. That would be a fun project. I would try it.