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 Twin O-Ring Friction Drive Wheel
A 40 mm diameter, 24 mm tall friction drive or idler wheel for a 5 mm motor shaft. It has two 45° flared grooves that take 3–3.5 mm cross-section O-rings or heavy rubber bands as a replaceable tyre. It is locked with an M3 set screw and a captured M3 nut. Use it to rebuild a perished rubber-tyred idler-drive setup like the ones on vintage turntables, or as a rim drive for a robot, turntable or sample roller. When the tyre wears out you swap the O-ring and keep the hub.
624 Bearing Tread Wheel
A 32 mm OD x 9 mm wide passive side wheel from the 'SG90 Wheeled Serpentine Snake Robot' kit. It has a 13.05 mm press pocket, 5 mm deep, for a 624 bearing (4 x 13 x 5 mm), and a 4 mm outer web with a 10 mm through-hole so an M4x16 SHCS and washer can bear on the inner race. A 3 x 1.5 mm centred tread groove takes a rubber band or O-ring tyre for sideways grip.
O-Ring ID Sizing Peg Tray
A 150 x 72 mm lipped bench tray with ten chamfered sizing pegs from 5 to 22 mm diameter. The front row is 5, 6, 8, 10 and 12 mm, left to right, and the back row is 14, 16, 18, 20 and 22 mm. Tip a mixed bag of unlabeled O-rings, grommets or seals into the tray. Slide each ring down the largest peg it fits snugly and stack it there, so every stack is sorted by inside diameter and you can find the size without a caliper.