Print-ready 3D models

Jansen 30 mm Stepper Crank

A 30 mm-throw drive crank for the 'NEMA17 Twin-Motor Strandbeest Walker' kit (print ×2). It is an 8 mm thick lever about 50 mm long. The 14 mm boss slides onto a NEMA17's 5 mm shaft (5.2 mm bore) and is locked by an M3 heat-set insert (4.0 mm bore) and an M3x6 set screw. The crank pin at M is a 4.5 mm bore with a 7.6 mm counterbore for the M4x35 socket head that carries the leg links.