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.*
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.
Ackermann Trapezoid Tie Bar
Fixed-length tie bar for the 'SG90 Ackermann Steering Rover Chassis' kit: a 77 x 24 x 6 mm flat bar joining both knuckle arms through 3.4 mm pivot holes 65.1 mm apart (two M3x25 SHCS + nylocks). A 3.4 x 16 mm centre slot takes an M3x20 pin through the SG90 horn's outer hole, so it works with any horn radius from about 10 to 16 mm.
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.
Ackermann Steering Knuckle Upright
A steered-wheel upright for rover and RC-scale robot chassis: a 34 mm tall post with a 5.3 mm kingpin bore (5 mm dowel or M5 bolt), a 20 mm deep 8.3 mm socket for an 8 mm stub axle locked by an M3 grub screw in a 4.0 mm heat-set boss, and an Ackermann tie-rod arm with a 3.4 mm M3 hole 32 mm from the kingpin, angled inboard. Overall 46 x 44 x 34 mm; mirror it in your slicer for the opposite side.