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.*
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.
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.
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.
N20 Twin Motor Carrier
The rear drive block of the 'SG90 Ackermann Steering Rover Chassis' kit. It is 34 x 70 x 17.1 mm and holds two N20 (GA12-N20, 12 x 10 mm) gearmotors back to back in a 12.4 x 9.6 mm channel, with the output shafts pointing outward. It bolts under the deck on the shared 24 x 44 mm M3 (3.4 mm) pattern using M3x30 screws that pass through the clamp cap. The gearboxes sit 0.4 mm proud, so the cap squeezes them firmly in place, and a notch in the cap-side face lets the motor wires out.
Print-In-Place 7-Link Track Strip
A 7-link, 12 mm-pitch print-in-place track strip, 28 mm wide and about 92 mm long, for the 'N20 Twin-Track Mini Tank Chassis' kit. Print 8 and join 4 into each 28-link loop. Each link has 8.4 mm knuckles and an integral 4 mm pin running in a 5 mm teardrop bore, plus a 5.6 x 7.6 mm window that the 12T sprocket teeth drive through. The strips join with M3x8 SHCS inserted from each track edge, passing through the last link's 3.4 mm bore and threading into the first link's 2.6 mm self-tap pilot.
Track Keel Skid Rail
A 40 mm long bolt-on skid rail (print 2) for the 'N20 Twin-Track Mini Tank Chassis' kit. It holds the lower run of the 12 mm-pitch track down between the drive and idler axles, and a 10 mm wide keel rides in the links' centre band. It attaches to the Tank Hull Tub side wall with two M3x12 SHCS and M3 nuts through 3.4 mm holes at x ±12 mm. The rail has a 45° stiffening gusset, counterbored head pockets and 3 mm lead-in chamfers on the keel.
12T Track Drive Sprocket
A 12-tooth, 12 mm-pitch drive sprocket (Ø51.2 mm over the teeth, 10 mm disc) for the 'N20 Twin-Track Mini Tank Chassis' kit. It fits directly onto an N20 gearmotor's 3 mm D-shaft with a 3.2 mm blind bore in a 16 mm hub that is 12.5 mm long. An M3 grub screw and a captured M3 hex nut lock it to the shaft, so no separate hub or plate stack is needed. The teeth have a 45° underside chamfer so they print without supports, and they mesh with the kit's print-in-place track links.
Twin N20 Motor Clamp Bar
A 30 x 49 x 5 mm clamp bar from the 'N20 Twin-Track Mini Tank Chassis' kit. It lies across the tops of both 12 x 10 mm N20 gearmotors and pulls them down into the Tank Hull Tub cradle with four M3x8 SHCS (3.4 mm holes at ±11/±20 mm) screwed into the hull's heat-set posts. Two 1.5 mm locating lips straddle the 12 mm motor bodies with 0.4 mm clearance, and a 10 mm notch passes the motor wires.
Rover Sensor Bumper Plate
An L-bracket front bumper for the 'N20 4WD Skid-Steer Rover Base' kit. Its 16 x 60 x 4 mm base bolts to the chassis plate at (68, ±15) with M3x12 screws and nuts, sitting in 6 mm counterbores. The 60 x 40 x 4 mm face wall has a 5 x 3 grid of 3.4 mm M3 holes on a 10 mm pitch for mounting sensors, and two 3 x 8 mm zip-tie slots. It prints on its side so bumper impacts load along the layers, not across them.
56 mm Set-Screw N20 Wheel
A 56 mm OD x 13 mm wide drive wheel for the 3 mm D-shaft of an N20 gearmotor, part of the 'N20 4WD Skid-Steer Rover Base' kit (print 4). It has a 3.3 mm bore, an M3 set screw with a captured M3 nut in a drop-in slot, a 4 mm access hole in the rim for the hex key, and two 3 x 1.5 mm tread grooves for rubber bands or O-rings. You can take the wheel off and put it back on as often as you like without the bore wearing loose, which is how press-fit hubs fail.
N20 Gearmotor Tunnel Clamp
A 24 x 26 x 22 mm block that holds one N20 micro gearmotor under the chassis, for the 'N20 4WD Skid-Steer Rover Base' kit (print 4). The gearbox slides into a 12.4 x 10.4 mm open-ended tunnel with 1 mm lead-in chamfers, and an M3x6 pusher screw in a 4.0 mm heat-set insert clamps it in place. Two M3 heat-set bores (4.0 x 6 mm, 16 mm apart) take M3x8 screws from the plate top.
N20 Rover Chassis Plate
A 150 x 96 x 4 mm chassis plate that sets the layout for every other part in the 'N20 4WD Skid-Steer Rover Base' kit. It has 3.4 mm M3 through-holes for four N20 gearmotor clamps, the Raspberry Pi 4 deck legs, a 2S 18650 battery cradle and the front sensor bumper, plus motor wire slots, two 30 x 8 mm wire pass-throughs and a 2 mm stiffening rim on the sides and rear.
N20 Gearmotor Zip-Tie V-Cradle Mount
A 48 x 34 x 20 mm chassis mount for micro metal gearmotors (N20/N30, 12 mm round can): a 90° V-cradle self-centres any can from about 10 to 14 mm diameter and two 4.5 x 2.4 mm tunnels take zip ties straight over the motor, so it needs no motor-specific bolt pattern. A 6 mm solid rear thrust wall stops the motor being pushed back by wheel side load, and the 4 mm base has four 3.4 mm M3 slots (11 mm of travel, on 30 x 25 mm centres) plus one round 3.4 mm M3 hole for a located third point.