Cybernetics, Prosthesis and Implant Design Illume 3D Printable Prosthetic by Adele Rehkemper and Cliff Shin It is a 3D printable prosthetic hand. All parts were designed to be put together in two piece assemblies. Only one part would need to be attached at a time during assembly. This avoided complex processes requiring two hands. A four-bar linkage was used as a finger joint coupling mechanism to produce consistent movement and greater force at the fingertip than a purely tendon-based design.