These parts are made by Meshmixer, a free tool to edit STL models.
Thanks 3DWP introduced this wonderful tools.
The optimus_arms.stl contains left and right arms, so you can print these objects at the same time. The optimus_legs.stl file is similar.
optimus_arms.stl | 26.1MB | |
optimus_body.stl | 18.3MB | |
optimus_left_arm.stl | 8.3MB | |
optimus_left_leg.stl | 11.6MB | |
optimus_legs.stl | 23.1MB | |
optimus_right_arm.stl | 17.8MB | |
optimus_right_leg.stl | 11.5MB |