Print-ready 3D models

Technic Axle Hub For 5 mm Shaft

A clamp-free output hub that turns any 5 mm motor shaft (NEMA 17, 775, most 37 mm gearmotors) into a LEGO Technic drive: a 5.3 mm shaft bore with an M3 grub screw at the bottom, a 5.0 x 2.0 mm cross-axle socket 14 mm deep on top with its own M3 grub screw, and a 44 mm flange carrying six 5.0 mm Technic pin holes on 8 mm pitch so a beam can be pinned on as a crank arm. Overall 44 mm diameter x 40 mm tall; the cross socket is sized for the 4.8 mm Technic axle so printed shrinkage lands it at a friction fit.