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.*
Hip Horn Drive Link
Red 87 x 40 x 6 mm drive link for the 'SG90 Parallelogram-Leg Biped Walker' kit. A 40 mm horn pad holds an SG90 horn with two M2x10 self-tapping screws through 2.4 mm radial slots (r = 5–16 mm) around a 5.5 mm centre hole. 60.0 mm away, a 14 mm boss has a 3.4 mm hole for the M3x20 pivot screw and nyloc nut into the ankle lug. Print two and flip one for the other leg.
Horn-Side Drive Arm
A 5 mm thick, 98 mm long drive arm that bolts onto a hobby servo horn. A 2.4 mm radial slot running 6–22 mm from the pivot takes M2 horn screws at any horn hole spacing, and a 7 mm access hole sits over the spline screw. The far end has a pad with two M3 self-tap pilots (2.6 mm, 15 mm deep, 12 mm apart) that screw into the pad edge, so you can attach a linkage, gripper finger or flag.
Differential Cross-Pin Link
Link for the 'NEMA17 Rocker-Bogie Mars Rover Chassis' kit (print ×2). It has 40 mm between hole centres and joins the 625 differential bar end to the rocker ear. End A is a 12 mm OD × 6 mm eye with a vertical 3.4 mm hole. End B is a 10 × 12 × 12 mm boss with a 3.4 mm cross-hole along Y, 6 mm up. The two hole axes are perpendicular, so the link works as a cardan-style joint. Each end takes an M3x25 bolt with a nyloc nut and washers.
Snap-Socket Linkage Rod
A flat link, 87 x 17 x 8 mm, with two snap sockets 70 mm apart (centre to centre). Print ×3 for the 'SG90 3-DOF Ball-Balancing Platform' kit. Each Ø17 mm ring has a Ø8.6 mm bore with a Ø10.4 mm double-cone band in the middle and a 1.5 mm split slot, so it clips over the Ø10 mm ball studs on the SG90 Ball-Stud Crank Arm and the Tray Ball-Stud Knuckle without screws. PETG is recommended so the rings flex without cracking.
608 Joint Robot Arm Link
A 132 mm U-channel arm link with a press-fit 608 bearing pocket (22.05 mm bore, 7.5 mm deep, stepped to a 16 mm clear bore) at each end on 100 mm centres, so two 8 mm shafts or M8 bolts give you a stiff, low-friction structural member for a small robot arm or four-bar linkage. The 4 mm floor carries a 20 × 20 mm M3 clearance pattern (MGN12H carriage or accessory bracket) and both 3 mm webs have 12 × 4 mm zip-tie slots for harness routing; overall 132 × 32 × 15 mm, ~33 cm³.