robotic hand 3d model

3d model of robotic hand that can be printed in pieces for assembly later. The hand should have full articulating fingers, space in the palm for 5 servos, one for each finger and a way to link each joint to a servo using steel wire, to mimic human finger movements. The design should be simple and show all assembly point with assembly to be done by a 12-year-old. No small pieces, use steel screws and nuts to join each joint