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 20-Slot Optical Encoder Disc
A 60 mm slotted encoder wheel with 20 wedge windows at a 50/50 duty cycle, on a 5 mm set-screw hub. You get 20 counts per turn from a single slot-type photointerrupter, or 80 with two sensors in quadrature. The disc is 1.8 mm thick so it runs in the slot of common U-type optical sensors, and the windows span radius 22–28 mm. The hub takes a 5 mm motor shaft with a captured M3 nut and set screw, and two M3 clearance holes 30 mm apart let you bolt it to a printed wheel hub instead.
608 Dead-Wheel Odometry Swing Arm
A spring-loaded swing arm for a passive odometry "dead wheel". It pivots on an 8 mm rod or M8 bolt and carries two stacked 608 bearings (8 x 22 x 7 mm) in a 16.5 mm hub, so your M8-bolt axle and tracking wheel stay square to the floor. Pivot to axle is 70 mm. There is a 4.5 mm hole for a spring or rubber band that keeps the wheel pressed down, and two M3 heat-set bosses 38 mm apart where you can attach your own encoder bracket. It's a cheap stand-in for commercial odometry pods on skid-steer and holonomic rovers.