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.*
GNSS Puck Ground-Plane 8 mm Mast Mount
An 80 mm disc that holds a GPS/GNSS module flat and up off your chassis on an 8 mm steel rod or carbon tube. The face is flat so you can stick copper tape on it as a ground plane. Strap slots in both directions take a hook-and-loop strap or a zip tie around square modules (the 22.6 mm spacing fits about 20–40 mm wide), and a 30 mm socket with ribs grips the mast with an M3 grub screw in a brass heat-set insert.
Spine Deck Pi 4 Plate
A 170 x 100 x 4 mm ribbed electronics deck for a rover chassis. It has raised bosses on the 58 x 49 mm Raspberry Pi 4 pattern with M2.5 nut pockets underneath, four 5.5 mm M5 holes for bolting to rails, slots for a PCA9685 servo board, battery-strap slots and wire pass-throughs.
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.
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.
Flip-Symmetric Steering Knuckle
Front steering knuckle for the 'SG90 Ackermann Steering Rover Chassis' kit, 12 mm tall. It has a Ø14 kingpin boss with a 3.4 mm bore for an M3x25 SHCS and nylock, and an 18 mm steering arm set at the 17.6° Ackermann angle, with a Ø10 tip boss and a 3.4 mm hole for the tie bar. The 14 x 13 mm axle block carries an M4x30 axle bolt through a 4.5 mm bore, held by a captured M4 nut. The part is symmetric top to bottom, so print two and flip one over to get the left and right knuckles.
SG90 Kingpin Steering Beam
This is the front axle beam of the 'SG90 Ackermann Steering Rover Chassis' kit. It is a 6 mm plate, 62 x 90 mm, with two Ø14 kingpin ears 76 mm apart for M3x25 kingpins, and a 24 x 44 mm M3 pattern that bolts it under the deck with M3x16 screws and nuts. It also has a 23.6 x 12.8 mm through-pocket for an SG90 servo, with 2.4 mm tab slots so it fits clone servos whose tab spacing varies. Two Ø2.9 holes, each with a Ø7 nut recess on top, clear the deck's front M2.5 Pi Zero screws.
Ackermann Rover Chassis Deck
A 170 x 64 x 4 mm deck with 8 mm stiffening rails. It is the spine of the 'SG90 Ackermann Steering Rover Chassis' kit, with a 120 mm wheelbase. It has two 24 x 44 mm M3 (3.4 mm) patterns, one for the steering beam and one for the N20 twin-motor carrier, fastened with M3x16 and M3x30 screws and nuts. It also has a 26 x 15 mm cut-out for the SG90 servo body, four Ø6 x 5 mm standoffs for a Raspberry Pi Zero (58 x 23 mm, M2.5) and zip-tie slots for a 2x18650 holder.
18650 Battery Tail Cradle
A 78 x 46 x 33 mm bolt-on tray that holds two 18650 cells (18.4 x 65 mm) side by side on the back of a rover chassis. Three saddle ribs with 19.4 mm half-round channels locate the cells. Velcro strap slots and zip-tie slots hold them down, and the front wall has four M3 heat-set bores (4.0 mm) for mounting.
Flagged: battery or DC power. Not for safety-critical use without independent engineering review.
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.
625 Differential Rocker Bar
This is the differential bar for the 'NEMA17 Rocker-Bogie Mars Rover Chassis' kit. It is a 172 × 28 × 8 mm bar that pivots under the deck on an M5x25 bolt. A 625 bearing (5 × 16 × 5 mm) press-fits into a 16.05 mm pocket in the 28 mm hub. Each end at ±80 mm has a 3.4 mm eye for the M3x25 cross-pin links, so the bar averages the two rocker angles and keeps the deck level.
Twin-Motor Bogie Arm
The rear bogie arm for the 'NEMA17 Rocker-Bogie Mars Rover Chassis' kit (print ×2; the arm is symmetric, so one print fits either side). It is an 8 mm thick flat plate, 126 × 64 mm. A 22.05 mm bore takes a press-fit 608 bearing on the M8x35 bogie pivot bolt. Two 46 × 46 mm NEMA17 pads, 80 mm apart, each have a 31 mm square of 3.4 mm holes for M3x12 screws and a 22.5 mm pilot hole. The two top outer corners are chamfered 8 mm so the arm clears the rocker as it swings.
M8 Rocker Pivot Pillow Block
Pivot block for the 'NEMA17 Rocker-Bogie Mars Rover Chassis' kit (print ×2). It carries the M8x40 rocker pivot bolt in an 8.4 mm teardrop bore 13 mm above the deck. It bolts to the deck grid with four M3x16 screws and hex nuts on a 40 × 20 mm pattern, through a 50 × 34 × 6 mm flange. The 24.5 mm tall rounded upright has two 45° gussets.
Rover Grid Deck Plate
This is the main 150 x 172 x 5 mm deck of the 'NEMA17 Rocker-Bogie Mars Rover Chassis' kit. It has a 20 mm pitch grid of 3.4 mm M3 through-holes, so electronics can mount anywhere with M3 screws. It has solid landing pads for the two M8 pillow blocks (M3x16 bolts with hex nuts under the deck), a 5.5 mm hole at (50, 0) for the M5x25 differential pivot, and a 3 mm stiffening lip around the edge. There are 44 lightening windows, each about 12 x 12 mm, to keep the weight down.
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.
Pi 4 Rover Deck With Legs
A 120 x 90 x 3 mm raised electronics deck with four integral 10 mm legs, part of the 'N20 4WD Skid-Steer Rover Base' kit. The legs stand it 40 mm above the chassis plate, and each foot takes an M3 heat-set insert (4.0 x 6 mm bore) for M3x8 screws from under the chassis. The deck has 2.9 mm M2.5 holes on the Raspberry Pi 4 58 x 49 mm pattern with 6 mm x 3 mm spacer bosses, a 4 x 7 grid of 3.4 mm M3 holes on a 10 mm pitch for a motor driver or ESP32, and two 30 x 10 mm cable windows.
2S 18650 Rover Battery Cradle
Twin-bore sleeve that holds a 2S pack of 18650 cells (18.4 x 65 mm) side by side on 22 mm centres. The 56 mm sleeve leaves the cell ends and nickel tabs exposed so you can wire them. Two end tabs with M3 clearance holes 66 mm apart bolt it flat to a rover chassis plate.
Flagged: battery or DC power. Not for safety-critical use without independent engineering review.
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.
Pi Zero To Pi 4 Footprint Adapter Deck
A 66 x 57 mm adapter plate that lets you mount a Raspberry Pi Zero on a robot deck already drilled for a Pi 4B/3B+. It bolts down through the Pi 4's 58 x 49 mm M2.5 pattern and has four 5 mm standoffs on the Zero's 58 x 23 mm pattern, so you can switch boards without re-drilling the chassis.
Dual 625 Outboard Wheel Axle Block
A flanged bearing block that holds two 625 bearings (5 x 16 x 5 mm, press-fit 16.05 mm pockets, 21.6 mm apart) on a 5 mm wheel axle. It bolts to a chassis side plate with four M3 screws on a 32 mm square. It takes the wheel load off wobbly TT gearmotor output shafts and other small drive shafts: couple the motor to the 5 mm axle and let this 44 x 44 x 32 mm ribbed block carry the load.
Rocker-Bogie Rover Bogie Arm
Bogie link for a rocker-bogie rover or trailer suspension: a 148 x 60 mm flat arm that pivots on a press-fit 608 bearing (22.05 mm seat, 7 mm deep, 8.3 mm shaft bore through a 4 mm shoulder) with two 8 mm stub-axle clamps 120 mm apart and 45 mm below the pivot. Each axle end is a split clamp pulled up by an M3 screw into a captured M3 nut, so wheel axles set and lock without set screws; 9 mm thick plate with lightening holes prints flat, layers in the load plane.