Heads up: many models on this page are AI-generated or uploaded untested. They may be misconfigured for the intended application — check the dimensions and tolerances, and verify or edit the model before printing or relying on it.*
5 mm Shaft Adjustable-Throw Crank Disc
A 70 mm crank disc for a 5 mm motor shaft such as a NEMA 17. An M3 heat-set insert (4.0 mm bore) takes a set screw that holds the 16 mm tall hub on the shaft. An M3 bolt slides in a 3.4 mm radial slot and locks against a captured M3 nut (5.7 mm channel), so the crank pin can be set at any throw from 14 to 31 mm. That gives a 28–62 mm stroke for pumps, shakers and kinetic linkages, and you don't have to reprint a new crank for each stroke length. Tick marks every 5 mm along the slot show the setting.
Slotted Servo Crank Arm
A 37 mm long, 4 mm thick flat crank for the 'MG90S Six-Servo Stewart Platform' kit (print ×6). It fits over a stock MG90S single-arm horn: the horn keys into a 6 mm wide, 1 mm deep recess on the underside and is fixed with two M2 self-tappers through a 2.4 mm radial slot. The slot runs from 6 to 16 mm radius, so the horn's hole spacing doesn't need to be known. A 7.5 mm centre hole clears the horn screw, and a 10 mm tip boss has an M3 clearance hole 24.0 mm from the shaft that takes the pushrod ball-stud tab with an M3x16 screw and a nylock nut.
Geneva Crank Pin Driver
This is the one-piece driver for the 'NEMA17 Geneva Indexing Turntable' kit. It fits on the NEMA 17's 5 mm shaft through a 5.3 mm bore and is held by an M3 set screw with a captured M3 nut. It combines a 50 mm pin disc, which holds a 5 mm x 13 mm steel crank pin at 20 mm radius, with a 33 mm locking disc 9 mm tall. The locking disc has a relief cut into it and holds the 6-slot Geneva wheel still between its 60° steps.
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.
Casement Window Crank Handle
Replacement folding-style crank handle for casement and awning window operators whose original plastic handle has stripped or gone missing — the mechanism outlives the handle and the OEM part is usually only sold as a whole $40–80 operator. The 26 mm OD hub has a 9.6 mm through bore and two opposed M4 heat-set inserts (5.5 mm bores) so set screws grip any splined, D or round operator stub from 5 to 9.5 mm; 80 mm crank throw, 16 mm dia grip, 105 mm long overall, 44 mm tall. Print in PETG or ASA if the window gets direct sun.