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.*
SG90 Tendon Capstan Drum
This capstan drum is part of the 'SG90 Tendon-Driven Continuum Trunk Arm' kit (print ×3). It keys onto the SG90's stock single-arm horn through a 7.5 x 2.5 mm underside slot and is held by an M2x10 screw that goes through a 2.4 mm hole with a Ø4.5 counterbore. A 0.8–1.0 mm braided tendon ties through a 1.8 mm cross hole in the Ø20 groove, which pulls in 31 mm of line per 180°. The drum is 12 mm tall with Ø28 flanges, and 45° chamfers on the flanges keep the line in the groove.
Antagonistic Tendon Twin-Groove Capstan
A 44 mm OD, 36 mm tall capstan pulley for a 5 mm motor shaft, with two separate 36 mm cable grooves so one shaft can drive a push-pull tendon pair for a zero-backlash robot joint. The shaft bore is 5.2 mm and locks with an M3 set screw into a captured M3 nut. Each groove has a 2.2 mm cable port into a hollow internal ring, so a crimped ferrule anchors each cable on its own.
5 mm Shaft Capstan Winch Drum
A flanged capstan drum that bolts straight onto a 5 mm stepper or gearmotor shaft (5.3 mm slip-fit bore) and pulls cord — motorising a roller blind or curtain, or driving a cable-tendon robot joint. 37 mm drum core, 48 mm flanges, 54 mm tall, with two M3 heat-set inserts at 90° for grub screws and two 3.6 mm cord anchor holes that let the knot hide inside the ribbed hub cavity.