U-Joint

thingiverse

Created using Tinkercad, this design can be edited online at https://tinkercad.com/things/fZkMbOmplIO. It requires support material for printing and can be produced as a single piece without post-production work. The model features 8mm shaft holes on both ends but has not been tested, so the range of motion is unknown. A sturdier output shaft, which isn't suspended in the air, is now available.