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-Driven Shoulder Clevis
A U-shaped shoulder clevis for robot arms. The 60 x 86 x 5 mm base plate bolts to a hip servo horn through a 9 mm centre hole and four radial M3 slots (r 7–15 mm). The two 6 mm cheeks rise 75 mm: one has a 20.6 x 41.3 mm MG996R-size pocket with tab slots, and the other has a 5.5 x 16 mm vertical M5 slot for the idler pivot, so you can line the pivot up with the servo shaft.
Lower Arm Channel Link
Shoulder-to-elbow link for the 'MG90S Animatronic Desk Lamp Robot' kit. It is a 146 x 47 x 28 mm U-channel printed web-down. The 32 mm tongue takes the shoulder servo horn on one side and an M4x16 bolt, M4 nut and 624 bearing on the other. At the top end, a 36 mm elbow clevis has two M3 heat-set bores for the slotted MG90S/SG90 plate and a 13.05 mm press-fit seat for a 624 bearing (4 x 13 x 5 mm).
Horn-And-Bearing Joint Yoke
A C-shaped yoke for a robot arm joint. The top arm bolts to a servo horn (7 mm centre hole plus two 2.4 mm screw slots) and the bottom arm holds a 624 bearing (13 mm OD) press-fit on the same axis, so the servo is supported on both sides instead of hanging off its spline. The 5 mm back plate has four M3 clearance holes on a 16 x 20 mm pattern to mount the next arm link, and the part prints on its side so the joint loads run along the layers, not across them.
SCARA Forearm With Elbow Pulley
This is the forearm link of the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit, measuring 159 × 44 × 35.5 mm. Its elbow hub carries two 608 bearings (8 x 22 x 7 mm) in 22.05 mm pockets on the 8 mm elbow rod, and it has a printed 60T GT2 pulley for 6 mm belt (37.69 mm tip OD, 44 mm flanges). A belt-anchor pillar holds both belt ends in 2.2 mm tangential slots, and each end wraps around an M3x16 pin screw held by a captured nut. A ribbed beam runs 120 mm out to a 34 x 34 mm tool pad with four M3 heat-set inserts on a 20 mm square and an 18 mm pen hole.
Cycloid Joint Output Arm
The 141 mm output link for the 'NEMA17 Cycloidal Joint Actuator' kit. It is 8 mm thick and has a pocketed I-section beam. Its Ø50 hub pad bolts to the carrier's M3 heat-set inserts with 4 M3 screws through Ø3.4 holes on a Ø36 circle, and a Ø8 centre relief hole clears the shaft or bearing. The 32 x 32 tip pad 100 mm out has 4 Ø3.4 holes on a 20 x 20 mm square (MGN12H pattern) for a gripper, sensor or the next joint.
16-Pin Cycloid Ring Housing
This is the ring-gear housing for the 'NEMA17 Cycloidal Joint Actuator' kit. It is a Ø96 x 18 mm ring that holds sixteen 5 x 18 mm steel dowel pins in Ø5.3 through-grooves on a 34 mm pitch radius, and clamps between the base plate and the cover with four M3x30 SHCS through Ø3.4 holes on the R42 circle. The disc lobe tips reach r 34.3 mm, so the Ø68 bore is relieved to Ø69.4 across the disc zone. Ø66 lips at the top and bottom wrap each pin about 224° so the pins can't fall inward.
X Arm Root Motor Block
A root block for a robot arm. A NEMA 17 stepper bolts to the underside of the 6 mm plate on its 31 mm square M3 pattern, with the shaft coming up through a 22.4 mm opening for the motor's centring boss. Two slit clamp sockets hold the arm's 8 mm rods 40 mm apart. Overall size is about 96 x 56 x 28 mm, and each rod clamp uses an M3 screw and a hidden nut.
Gripper Idler Jaw
This is the idler finger of the gear-meshed gripper, part 8 of the 'SG90 Four-Axis Desktop Robot Arm' kit. It is a flat jaw 6 mm thick and 62 mm long that turns on an M3x20 pivot bolt through a Ø3.4 bore in a Ø20 hub. The hub carries a module 1.0, 20° involute sector: six teeth on a Ø20 pitch circle (tip Ø22, root Ø17.5), with a tooth gap centred toward the drive jaw so the two mesh at a 20 mm centre distance. The finger doglegs in to a ridged grip face that closes 3 mm from the drive jaw's face.
Gripper Drive Jaw
This is the servo-driven finger, part 7 of the 'SG90 Four-Axis Desktop Robot Arm' kit. It is a flat jaw, 6 mm thick and about 74 mm long. Its hub carries a module 1.0 gear sector: 7 involute teeth at 20° pressure angle on a Ø20 pitch circle (tip Ø22), meshing with the idler jaw at a 20 mm centre distance. The underside has a 1.8 mm pocket that takes an SG90 single-arm horn, plus a Ø5.3 hole for the horn screw. The finger doglegs inward to a flat grip face with ridges at a 3 mm pitch.
Gripper Servo Palm
This palm is part 6 of the 'SG90 Four-Axis Desktop Robot Arm' kit. It is a 65 x 52 x 5 mm plate that holds the gripper SG90 servo in a 28 x 12.6 mm window with M2 ear slots, which puts the drive-jaw axis at (-10, 0). The M3 idler-jaw pivot runs in a 3.4 mm slot with 5 mm of travel on a raised 2 mm washer pad, so you can set the 20 mm gear mesh. The palm bolts to the forearm tip with two M3 screws through Ø3.4 holes 15 mm apart.
Forearm Wrist Link
This is the elbow-to-wrist link of the 'SG90 Four-Axis Desktop Robot Arm' kit. It is a flat bar 5 mm thick and 18 mm wide, 83 mm long from the elbow axis to its rounded tip. The Ø26 × 6 mm elbow hub screws to an SG90 double-arm horn. The horn sits in a 7.5 × 36 × 1.8 mm pocket that has a short rear lobe so the slot is fully walled, with a Ø5.3 hole for the horn screw. The flat wrist end carries the gripper palm on two M3 bolts through Ø3.4 holes 15 mm apart, at 60 and 75 mm from the elbow axis. Their M3 nuts sit in 5.7 mm captured hex pockets on the underside.
Upper Arm Elbow Link
This is the shoulder-to-elbow link of the 'SG90 Four-Axis Desktop Robot Arm' kit. It is a 5 mm flat bar, 22 mm wide, 80 mm between axes and 119 mm long overall. The Ø24 × 9 mm shoulder hub has a double-arm SG90 horn pocket on the bottom face (7.5 × 36 × 1.8 mm, Ø5.3 screw hole) and a Ø16.05 × 5 mm press-fit pocket on top for a 625 bearing (5 × 16 × 5), with a 2.2 mm web between them. The elbow end has a 28 × 12.6 mm SG90 window with M2 ear slots, which puts the elbow servo shaft at 80 mm.
Shoulder Idler Cheek 625
An upright cheek plate for a robot-arm turntable. It holds the idle end of an M5 shoulder axle 33 mm above the base, with a captured M5 nut on the inner face so the axle can be tightened from one side. The 30 x 40 mm gusseted foot has two 10 mm M3 slots so you can slide the cheek to take up axial play against a 625 bearing stack.
Yaw Turntable Shoulder Yoke
This is the Ø84 x 5 mm yaw turntable for the 'SG90 Four-Axis Desktop Robot Arm' kit. It screws to the yaw servo's double-arm SG90 horn through a 1.8 mm underside pocket with a Ø5.3 centre hole. It also has an upright 5 mm wall with a 28 x 12.6 mm SG90 window and M2 ear slots, which puts the shoulder axis 38 mm above the underside. Two gussets brace the wall, and two Ø9 bosses carry Ø4.0 x 6 mm M3 heat-set bores at (22, ±14) for the 625-bearing idler cheek.
SG90 Arm Base Pedestal
The base and yaw-servo housing of the 'SG90 Four-Axis Desktop Robot Arm' kit. It is a hollow 100 x 100 x 40 mm pedestal with a 5 mm top deck. The deck has a 28 x 12.6 mm SG90 window with 2.4 mm M2 ear slots, which puts the yaw shaft at the deck centre. It screws down with four #8 wood screws through Ø4.8 holes in corner columns on an 84 mm square, and a 14 x 8 mm notch lets the servo cable out.
NEMA 17 Cycloidal Reducer Cartridge
A 16:1 single-disc cycloidal gearbox that bolts directly to a NEMA 17 face (31 mm square M3 pattern, 22 mm pilot boss recessed, 5 mm shaft), giving a hobby robot joint high reduction and low backlash in a 66 mm dia x 22.5 mm stack instead of a €1000 harmonic drive. It prints as four nested pieces in one job — pin housing, cycloidal disc with six 6 mm output pins, eccentric cam with an M3 grub screw, and an output carrier with three M4 mounting holes on a 38 mm circle.
Robot Joint Harness Dress Clamp
A bolt-on cable dress clamp for the shoulder and elbow joints of printed robot arms, quadrupeds and hexapods: a 180 deg snap-in channel with a fixed 16 mm minimum bend radius parks a service loop so the harness flexes instead of kinking where it crosses the joint. The 9 mm wide channel (tapering to a 7.5 mm snap mouth) takes a typical 6-8 mm servo/encoder bundle, bridge caps capture it at both leg ends, and it mounts with four M3 screws on an 18 x 13 mm pattern. Overall 54.4 x 51.2 x 17 mm with a 20 mm core hole for a tie or driver access.
Flagged: lifting or tensioned load. Not for safety-critical use without independent engineering review.
Dual 608 Bearing Yaw Joint Pedestal
A pedestal that preloads two 608 bearings (8 x 22 x 7 mm) 36.6 mm apart on a common vertical axis, giving a printed robot-arm shoulder/waist joint the moment stiffness people normally pay $100+ for a cross-roller bearing to get. 44 x 44 mm gusseted flange with four M4 clearance holes on a 32 mm square, 44 mm tall, 19 mm centre bore for an 8 mm shaft plus collars, and a slotted pinch collar with an M3 bolt and captured nut that takes the slop out of the upper press fit.