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.*
Rotating Gondola Line Arm
A 64 x 36 x 6 mm swivel arm from the 'NEMA17 Hanging Wall Polargraph Drawbot' kit (print two). Its 22.8 mm chamfered bore turns freely on the Ballast Gondola Pen Hub's 22.0 mm pen sleeve, so each drive line stays aimed at the pen axis at every hang angle. The line ties off through a 2.5 mm countersunk eyelet 40 mm from the axis, and a 1.5 mm knot groove on the top face seats the knot.
Ballast Trough Screw Lid
This is the 90 mm OD x 3 mm annular lid from the 'NEMA17 Hanging Wall Polargraph Drawbot' kit. It closes the Ballast Gondola Pen Hub's shot trough so the ballast can't fall out. Its 22.6 mm bore slides over the hub's 22.0 mm pen sleeve. A 30 mm OD thrust ring, 2 mm high, gives the two rotating line arms a smooth bearing face. Three M3x8 socket-head screws go through 3.4 mm holes on a 40 mm radius into the hub's M3 heat-set inserts, and six 1.6 mm radial ribs stiffen the plate.
Ballast Gondola Pen Hub
This is the main gondola body for the 'NEMA17 Hanging Wall Polargraph Drawbot' kit. It is a 90 mm dia x 46 mm hub with a 22 mm OD pen sleeve and a 14 mm through-bore that takes pens 8–13.5 mm across. The sleeve sits on the axis of an annular ballast trough, which holds about 120–150 g of shot or coins to give steady pen pressure. The trough is closed by the kit's screw lid, fixed with three M3x8 screws into M3 heat-set inserts (4.0 mm bores) at r = 40 mm. A 3.6 mm slot in the sleeve lets the collar's M3x16 screw clamp the pen, and a 1 mm chamfer on the base helps it glide over paper.
Chamfered Polargraph Line Spool
A 42 mm dia x 44 mm line spool from the 'NEMA17 Hanging Wall Polargraph Drawbot' kit (print two). It has a 30 mm drum that takes up 94.2 mm of line per turn, a 5.2 mm bore for the NEMA17's 5 mm shaft, and a radial 4.0 mm bore for an M3 heat-set insert and set screw. A 2 mm anchor hole in the outer flange holds the line. Both flanges are 45° cones, so it prints without supports, and a hollowed core keeps it to about 25 cm³.
NEMA17 Spool Standoff Cage
This is the motor cage for the 'NEMA17 Hanging Wall Polargraph Drawbot' kit (print two). It has a 66 x 66 x 6 mm NEMA17 plate with four 3.4 mm holes on a 31 mm square for M3x10 screws and a 22.4 mm bore for the pilot boss. Four 12 mm posts, 55 mm tall, have 5.5 mm bores for M4 heat-set inserts and bolt to the Wall Backer Plate. They hold the stepper facing out from the wall and leave a 42 mm clear space where the line spool turns, with a web on the top side and the other three sides open.
Wall Backer Plate
A 110 x 70 x 8 mm wall anchor plate from the 'NEMA17 Hanging Wall Polargraph Drawbot' kit (print two). It fastens to the wall with four #8 wood screws in counterbored 4.8 mm holes on a 90 x 50 mm pattern. The spool standoff cage's four 12 mm posts drop into 12.4 mm square recesses on a 54 mm square and are held by M4x10 cap screws driven from the wall side. Those screw heads sit in 8 mm counterbores, below the flat wall face.
Upper Leg Bearing Plate
The outer half of the upper leg in the 'MG996R 12-DOF Quadruped Robot Dog' kit. It is a 169 x 60 x 5 mm plate that screws onto the four 44 mm posts of the Upper Leg Servo Plate with M3 screws, which sit in 6.5 mm counterbores and thread into heat-set inserts. At the shoulder, a 30 mm boss holds a press-fit 625 bearing (16.05 x 5.2 mm pocket, 6 mm through-hole) for the M5x20 pivot bolt. At the knee, a 5.5 x 16 mm M5 slot is the idler side of the 44 mm knee clevis, and you slide it to line the pivot up with the servo shaft.
Upper Leg Servo Plate
The inner half of the upper leg in the 'MG996R 12-DOF Quadruped Robot Dog' kit. It is a 169 x 60 x 5 mm plate. At the shoulder it takes a 25T round servo horn: a 9 mm centre hole and four 3.4 mm radial slots at r 7–15 mm for M3x10 screws. At the knee it holds a second MG996R in a 41.3 x 20.6 mm pocket, with tab slots that fit 46–55 mm hole spacing for M3x16 screws. Four 10 mm x 44 mm posts with 4 mm bores for M3 heat-set inserts join it to the outer bearing plate.
Twin Hip Servo Frame
The front and rear end plate for the 'MG996R 12-DOF Quadruped Robot Dog' kit. You print the same part twice. Each 170 x 66 x 6 mm plate holds two MG996R hip servos in 41.3 x 20.6 mm pockets. Four slots per pocket take M3x16 screws with nuts and fit tab hole spacings from 46 to 55 mm. A 30 mm rear ledge takes two 2020 rails at 60 mm centres on M5x10 screws and T-nuts. The plate also has a 30 x 16 mm wire pass-through and lightening windows.
Rod-Clamp Station Pointer Collar
This part is for the 'NEMA17 Geneva Indexing Turntable' kit. The collar clamps to the top of the fixed 8 mm rod through an 8.3 mm bore, with an M3 set screw and a captured M3 nut. Its OD 11.4 × 4.5 mm pad holds the upper 608 bearing's inner race in place. The collar is 22 mm across and 14.5 mm tall. A 60 mm pointer arm ends in a 60° arrow that sits over the platter's r = 50 mm stations.
140 mm Six-Station Index Platter
The 140 mm × 4 mm work platter for the 'NEMA17 Geneva Indexing Turntable' kit. It bolts to the 608 spindle tube with 3x M3x6 bolts through counterbored 3.4 mm holes on a 38 mm PCD. The 24 mm centre hole clears the pointer collar's pad. Six stations sit at r = 50 mm, 60° apart, each with two M3 holes 20 mm apart and a 6 mm locating dimple for mounting fixtures. Six 3 × 3 mm radial ribs on the underside keep it flat. It prints top-face-down, so the work surface, dimples and 1 mm rim chamfer all come out off the bed.
608 Twin-Flange Spindle Tube
The rotating spindle riser for the 'NEMA17 Geneva Indexing Turntable' kit. It is 30 mm tall, with 46 mm flanges and an OD 30 body that flares out through a self-supporting 45° cone. The bottom flange bolts to the Geneva wheel with 3x M3x10 through 3.4 mm holes on a 38 mm PCD. The top takes an upper 608 bearing (8 × 22 × 7 mm) in a 22.05 mm press seat with a lead-in chamfer, and has 3x M3 heat-set inserts (4.0 × 5 mm) for the platter. The 10 mm through-bore clears the fixed 8 mm rod.
6-Slot Geneva Star Wheel
This is the 6-slot Geneva star wheel for the 'NEMA17 Geneva Indexing Turntable' kit. It is 69.6 mm across and 8 mm thick, with 5.5 mm slots and R17 locking arcs sized for a 40 mm centre distance. The driver's 5 mm steel crank pin turns it in exact 60° steps, and the driver's locking disc holds it still between moves. It spins on a 608 bearing (8 × 22 × 7 mm) pressed into a 22.05 mm seat with a 1.5 mm lip. On top it takes 3 M3 brass heat-set inserts on a 38 mm PCD, which bolt the spindle tube above it.
Geneva Crank Pin Driver
This is the one-piece driver for the 'NEMA17 Geneva Indexing Turntable' kit. It fits on the NEMA 17's 5 mm shaft through a 5.3 mm bore and is held by an M3 set screw with a captured M3 nut. It combines a 50 mm pin disc, which holds a 5 mm x 13 mm steel crank pin at 20 mm radius, with a 33 mm locking disc 9 mm tall. The locking disc has a relief cut into it and holds the 6-slot Geneva wheel still between its 60° steps.
Winch Fairlead Top Brace
This top brace is part of the 'N20 Self-Locking Worm-Drive Winch' kit. It is a 96 x 50 x 6 mm ribbed plate that bolts across the tops of both 608 bearing cheeks with four M3x12 socket head cap screws, which go into the cheeks' M3 heat-set inserts through 3.4 mm holes with 6.5 mm counterbores. It holds the cheeks square and guides the line through a 32 x 10 mm round-ended hawse slot. The slot has 1.5 mm 45° chamfers top and bottom so the line never rubs on a sharp edge.
Twin-Flange Line Drum
Part of the 'N20 Self-Locking Worm-Drive Winch' kit. This 57 mm long spool has a 30 mm drum between two 42 mm flanges. It slides onto the kit's 8 mm steel axle (8.3 mm bore) and bears on a 608 bearing's inner race through an 11 mm shoulder. It takes three M3 heat-set inserts (4.0 x 8 mm bores on a 22 mm PCD) for the 24T worm wheel's M3x16 screws, plus an M3x8 grub screw and captured M3 nut in the 16 mm hub. The line anchors through a 2.5 mm radial hole into the hollow core or through a 2.5 mm hole in the flange.
24T Winch Worm Wheel
A module 1.5, 30° pressure angle, 24-tooth worm wheel for the 'N20 Self-Locking Worm-Drive Winch' kit. It has a 39 mm OD, a 10 mm face and a 16 x 10 mm hub, with an 11 mm shoulder that bears on the 608 inner race. The 8.3 mm bore slip-fits the 8 mm steel axle, and an M3x8 grub screw with a captured M3 nut locks it. Three M3x16 screws on a 22 mm PCD bolt it to the line drum's heat-set inserts.
Module 1.5 Winch Worm
This is the self-locking worm for the 'N20 Self-Locking Worm-Drive Winch' kit. It is a single-start, right-hand, module 1.5 worm: 15 mm OD, 12 mm pitch diameter, 4.712 mm lead and a 7.1° lead angle. It has a 16 x 10 mm collar with a 3.1 mm bore, 10 mm deep, for the N20 3 mm D-shaft, which an M3x8 grub screw and captured M3 nut hold. Its 4 mm tail pin runs in a 624 bearing (4 x 13 x 5 mm). The overall length is 39 mm, and it prints standing on the collar face.
N20 Worm Motor Sled
This motor sled is part of the 'N20 Self-Locking Worm-Drive Winch' kit. It holds an N20 gearmotor (12 x 10 mm gearbox, 3 mm D-shaft, fixed with two zip-ties) and a 624 tail bearing (4 x 13 x 5 mm, 13.05 mm press pocket) in line with the worm axis. It bolts to the base plate with three M3 heat-set inserts (4.0 mm bores) and M3x10 screws, and measures 22 x 95 x 24.5 mm. The middle insert bore goes through the floor because the floor under the worm is only 6 mm thick.
608 Axle Bearing Cheek
This is the upright bearing cheek for the 'N20 Self-Locking Worm-Drive Winch' kit. Print two. Each cheek is a 9 x 50 x 70 mm plate. It takes a 608 bearing (8 x 22 x 7 mm) in a 22.05 mm press-fit pocket that is 7.1 mm deep and has a 0.5 mm lead-in chamfer. A 12 mm through-hole lets the 8 mm steel axle pass, and four M3 heat-set inserts (4.0 mm x 8 mm bores) fix it to the base plate below and the fairlead brace above.
Worm Winch Base Plate
This is the base plate for the 'N20 Self-Locking Worm-Drive Winch' kit. It measures 146 x 105 x 6 mm and sets the position of every other part: the two 608 bearing cheeks and the N20 worm motor sled each bolt on with M3x10 socket head cap screws, inserted from underneath through 3.4 mm holes with 6.5 mm counterbores, into M3 heat-set inserts. Four more 3.4 mm corner holes mount the winch to your robot. Five rounded windows remove weight, and raised corner marks show where each cheek sits.
N20 D-Shaft Rear Wheel
Driven rear wheel (print two) for the 'SG90 Ackermann Steering Rover Chassis' kit. It is Ø60 x 20 mm with the same tyre grooves as the front wheel: 3 x 1.5 mm, 5 mm in from each face. The Ø16 hub has a 3.2 mm bore for the N20's 3 mm D-shaft, locked by a radial M3 heat-set insert (Ø4.0 bore) and an M3x5 grub screw that bears on the shaft flat. The spoke pattern leaves a gap over the insert, and a Ø5 hole through the rim lets a soldering iron and a 1.5 mm hex key reach it.
624 Bearing Front Wheel
A free-rolling Ø60 x 20 mm front wheel for the 'SG90 Ackermann Steering Rover Chassis' kit. It has two tyre grooves (3 x 1.5 mm, 5 mm in from each face) for O-rings or rubber bands. Each face has a Ø13.05 x 5.2 mm press-fit pocket for a 624 bearing (4 x 13 x 5 mm), and a Ø6 bore passes through the web for the knuckle's M4x30 axle bolt. Print two. It prints flat with no supports: a 4 mm floor web and six full-height spokes join the 3 mm rim to the Ø20 hub.
N20 Carrier Clamp Cap
A 34 x 70 x 4 mm ribbed clamp plate for the 'SG90 Ackermann Steering Rover Chassis' kit. It closes the N20 Twin Motor Carrier's channel and squeezes both GA12-N20 (12 x 10 mm) gearmotors, which stand 0.4 mm proud of the channel, so they can't wobble. Four 3.4 mm holes on the 24 x 44 mm pattern take the M3x30 screws that run up through the cap, the carrier and the deck. Two 2 x 3 mm ribs stiffen the plate over the gearboxes.