A maker named Raph reverse-engineered and 3D printed a harmonic pin-ring cycloidal gearbox inspired by TQ electric bicycle motors. Unlike traditional cycloidal drives that use load pins and are bulkier, this design uses just two toothed discs 180° out of sync to cancel wobble and reduce part count significantly. The mechanism is a form of strain wave gearing, originally patented in 1957. 3D model files are available on GitHub and MakerWorld for anyone wanting to experiment with the design.
Sort: