Lever Hand

grabcad

This is my second entry for the e-NABLE Modular Prosthetic Terminal Device Challenge. The design features parts that can be 3D printed without supports, except for the palm section where the thumb attaches. Although it has only three fingers, cutouts are included to give a five-finger appearance and reduce material use. Designed to clamp onto objects like cups and rackets, each finger's lever can be tightened or loosened for varying pressure and joint locking. While less durable than my other submission, it is lighter and fully printable. Optional glue strengthens the wrist locks and thumb connection point. Ambidextrous, this hand works for either right or left use. All STL files are oriented for z-up slicers. The design also needs one 25mm M10x1.5 screw to work with the ICRC wrist unit, which can be successfully 3D printed.