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.*
Mirror Arm Serrated Friction Knuckle
This is a ratcheting friction knuckle for mirror, lamp or camera arms made from 8 mm rod. A 26 mm hub with 24 serrated teeth locks against a second copy on an M5 bolt, and a captive nut sits underneath. A 20 mm tall split clamp grips the rod in a vertical 8.3 mm bore and tightens with two M3 pinch screws.
Trash Cart Lid Steel-Pin Hinge Knuckle
This bolt-on lid knuckle replaces the moulded hinge pintles on curbside trash and recycling carts, which snap once the plastic goes brittle in the sun. You run a plain 8 mm steel rod through the cart's hinge ears, and the 40 mm-long knuckle turns on it in an 8.3 mm slip-fit bore. The knuckle's 40 x 40 mm flange has two 5.5 mm x 16 mm slots, so you can bolt it to the lid's rear lip with M5 bolts wherever the lid happens to line up. Print two, one for each side.
Steel-Pinned Print-In-Place Knuckle Link
A two-link knuckle joint that prints already assembled: a 12 mm tongue turns on a 10 mm printed pin between clevis cheeks, with 0.5 mm clearance all round. The pin has a 4.1 mm bore, so you can push a 4 mm steel dowel through it for extra stiffness. Each 24 x 8 mm arm has four M3 clearance holes on a 10 x 12 mm pattern for bolting to robot arms, legs or linkages, and the tongue's fillet acts as a hard stop when the link is straight.
Ackermann Steering Knuckle Upright
A steered-wheel upright for rover and RC-scale robot chassis: a 34 mm tall post with a 5.3 mm kingpin bore (5 mm dowel or M5 bolt), a 20 mm deep 8.3 mm socket for an 8 mm stub axle locked by an M3 grub screw in a 4.0 mm heat-set boss, and an Ackermann tie-rod arm with a 3.4 mm M3 hole 32 mm from the kingpin, angled inboard. Overall 46 x 44 x 34 mm; mirror it in your slicer for the opposite side.