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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.
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.
Micro Servo Slot Mount Plate
A 64 x 22 x 5 mm slotted servo carrier used at all four axes of the 'MG90S Animatronic Desk Lamp Robot' kit. It takes an MG90S or SG90 servo through a 22.8 x 12.6 mm window, with M2 screws through the tabs on a 27.8 mm pitch. Two rounded 3.4 mm M3 slots allow ±3 mm of travel on the kit's 44 mm heat-set insert pitch, so you can line up the spline on the joint axis even when a clone servo's tabs are a little off.
Seven-LED Lamp Head
This is the tilting head of the 'MG90S Animatronic Desk Lamp Robot' kit. It has a 70 mm shade with a 3 mm face that takes seven 5 mm LEDs through 5.3 mm holes, one in the centre and six on a 16 mm radius. The 32 mm-wide R14 tilt tongue sits with its axis 50 mm above the face. The side-A pad takes the MG90S/SG90 horn. Side B has a 4.5 mm M4 hole, an M4 nut pocket (7.2 mm across flats) and a 7 mm boss that runs on the Upper Arm's 624 bearing (4 x 13 x 5 mm). The pivot is an M4x16 bolt.
Upper Arm Channel Link
This is the elbow-to-head link of the 'MG90S Animatronic Desk Lamp Robot' kit. It is a 131 x 47 x 28 mm U-channel, printed web-down, with its joint axes 95 mm apart. The elbow tongue is 32 mm wide and takes the MG90S/SG90 horn on one side. On the other side it takes an M4x16 bolt, a captive M4 nut and a 7 mm boss that runs on a 624 bearing (4 x 13 x 5 mm). The head clevis is 36 mm wide. It has two M3 heat-set bores (4.0 mm) at a 44 mm pitch for the slotted servo plate, and a 13.05 mm press-fit seat for a 624 bearing.
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).
Turntable Shoulder Clevis
Yaw turntable for the 'MG90S Animatronic Desk Lamp Robot' kit. It is a 118 mm disc that rides on the Weighted Yaw Base Tub's thrust rim at r=54–60, centred by a 53.5 mm skirt. A 32 mm solid horn pad with a 7 mm screw-access hole takes the MG90S/SG90 yaw servo horn. The shoulder clevis sits 36 mm above the deck, with 36 mm between the cheeks. The servo cheek has M3 heat-set bores at a 44 mm pitch and a 34 × 16 mm body window for the slotted servo plate. The bearing cheek has a press-fit 624 seat, 13.05 × 5 mm, behind a 10 mm lip. The disc also has two 20 × 8 mm wire slots.
Weighted Yaw Base Tub
The foundation of the 'MG90S Animatronic Desk Lamp Robot' kit. It is a round tub, 120 mm OD x 40 mm tall, and the turntable skirt centres on a built-in thrust rim: a flat annulus from r=54 to r=60 at Z=40 with a 45° chamfered ledge underneath. Two 10 mm posts hold the slotted micro-servo plate on M3 heat-set inserts, so an MG90S or SG90 yaw servo hangs in a clear bay. A ring trough at r=41–57 holds steel washers or BBs as ballast, and a 14 x 10 mm notch lets the cable out.
Pi Zero Snake Head
The open-top head from the 'SG90 Wheeled Serpentine Snake Robot' kit. It measures 90 x 36 x 33 mm and holds a Raspberry Pi Zero or Zero 2 W on four 6 mm standoffs spaced 58 x 23 mm, fastened with M2.5x12 screws and nuts. The 4 mm rear wall has four 3.4 mm holes and bolts to the first segment housing with M3x12 SHCS. The front face has four M3 heat-set bores (4.0 x 8 mm) on the same 16 x 20 mm pattern for sensor plates. A split port window in the left wall gives access to the Pi's USB and mini-HDMI connectors.
624 Bearing Tread Wheel
A 32 mm OD x 9 mm wide passive side wheel from the 'SG90 Wheeled Serpentine Snake Robot' kit. It has a 13.05 mm press pocket, 5 mm deep, for a 624 bearing (4 x 13 x 5 mm), and a 4 mm outer web with a 10 mm through-hole so an M4x16 SHCS and washer can bear on the inner race. A 3 x 1.5 mm centred tread groove takes a rubber band or O-ring tyre for sideways grip.
Wheel Axle Bridge
A 16 x 36 x 11.5 mm black box-section axle bridge from the 'SG90 Wheeled Serpentine Snake Robot' kit. It bolts under each Servo Segment Housing floor with two M3x12 SHCS through 3.4 mm holes into the floor's M3 heat-set inserts. Each flat outer cheek at y = ±18 carries an 11 mm M4 heat-set boss with a 5.5 mm teardrop bore. That bore takes an M4x16 SHCS as the axle for a 624-bearing tread wheel. A bottom tie and a centre web stiffen the cheeks against wheel side-load, and relief pockets let a hex key reach the M3 screw heads.
Servo Tab Clamp Frame
A 36 x 34 x 6 mm black clamp frame from the 'SG90 Wheeled Serpentine Snake Robot' kit. It holds an SG90 or MG90S servo's mounting tabs down onto the Servo Segment Housing's z=33 seat, and the servo body and output shaft pass through its 23.6 x 13.0 mm opening. Four 3.4 mm holes on a 16 x 22 mm pattern take M3x12 SHCS into the housing's heat-set inserts. The frame clamps the tabs flat, so it works whatever the clone's tab thickness or hole spacing.
Servo Segment Housing
Open-top body segment for the 'SG90 Wheeled Serpentine Snake Robot' kit. It measures 50 x 36 x 33 mm and holds an SG90 or MG90S servo on a z=33 tab seat. Four M3 heat-set pillars take the clamp frame, and a 16 x 20 mm M3 heat-set face bolts to the next yoke. It also has an M4 pivot slot for the 624-bearing joint bolt and two M3 heat-set floor bosses for the wheel axle bridge.
Front Arm Crossbeam
This is the front crossbeam for the 'SG90 Sawtooth-Foot Inchworm Crawler' kit. It ties the horn-side drive arm and the idler-side swing arm to the front sawtooth foot. The plate is 40 x 80 x 6 mm with four 3.4 mm M3 clearance holes on the 30 x 20 mm foot pattern. It also has four 3.4 mm arm slots at x ±6 that run 15–33 mm out from the centre on each side, so the arm spacing can be adjusted. Each slot has a 6.5 mm wide, 3.5 mm deep counterbore underneath, which keeps the M3x16 screw heads flush against the foot.
Idler-Side Swing Arm
This is the pinned side of the front yoke in the 'SG90 Sawtooth-Foot Inchworm Crawler' kit. It is a 5 mm thick, 94 mm long flat arm with an 8 mm radius boss and a 4.3 mm slip-fit bore that rides on the kit's 4 mm steel pin. Its pad edge is 20.1 mm below the pivot and has two 2.6 x 15 mm M3 self-tap pilots at x 64 and 76, where M3x16 screws come up through the front crossbeam.
SG90 Side-Lying Clamp Strap
This inverted-U strap is part of the 'SG90 Sawtooth-Foot Inchworm Crawler' kit. It clamps an SG90 servo lying on its side onto the chassis pedestal, gripping the body so no screws go through the servo's fragile ears. The strap is a 46 x 10 x 4 mm bridge with two 12 mm legs on a 38 mm spacing and a 30 mm inner gap. Each leg has a 3.4 mm hole and a 6.2 mm head pocket open at the end, and takes an M3x16 screw into the pedestal's M3 heat-set inserts.
Sawtooth Traction Foot
This is the one-way grip sole for the 'SG90 Sawtooth-Foot Inchworm Crawler' kit (print ×2). It is a 60 x 50 x 4 mm plate with 1.5 mm sawtooth ridges on a 5 mm pitch, so it slides forward and bites when pushed back, which turns the servo's rocking into crawling. The top face takes four M3 brass heat-set inserts in 4.0 mm bores on the kit's 30 x 20 mm pattern (the bores run through the 5.5 mm foot). A 45° notch on the top edge marks the front.
Inchworm Servo Pedestal Chassis
This is the rear body of the 'SG90 Sawtooth-Foot Inchworm Crawler' kit. It is a 136 x 60 x 4 mm deck with a grid of 3.4 mm holes on a 10 mm pitch, where the rear sawtooth foot mounts with M3 screws. It also has two 3 x 22 mm battery-strap slots and a hollow, ribbed pedestal 16 mm tall that holds an SG90 servo lying on its side. The servo sits between cradle walls 23.6 mm apart and is clamped through two M3 brass heat-set inserts in 4.0 mm bores. Two 3.4 mm deck holes take the idler pivot post with M3x12 screws and nuts.
Split Ball Joint Hemisphere Set
This set holds every ball and spacer for the 'SG90 Mini Delta Pick-and-Place Robot' kit on one 87 × 87 mm sprue tree: 24 hemispheres, each 12 mm dia × 6 mm tall with a 3.4 mm M3 bore, and 12 spacers, 7 × 5.25 mm. Six hemispheres have a 6.2 mm counterbore for an M3x40 SHCS head and six have a 5.7 mm hex pocket for the M3 nut. Snap them off the sprue and they make the six ball pairs that seat in the 12.4 mm cups of the link rods.
Delta Tool Effector Plate
This is the moving tool platform for the 'SG90 Mini Delta Pick-and-Place Robot' kit. It is a 62 mm, 5 mm thick truncated-triangle plate carrying three 8 × 14 × 22 mm joint blocks at a 20 mm radius. Each block has a horizontal 3.4 mm bore at z = 16 for the M3x40 SHCS split-ball stack, which puts the ball pairs at ±15 mm. The centre has a 12 mm tool hole and four M3 holes (3.4 mm) on a 20 mm square. The edges are notched concave under the ball pairs so the link-rod cup bosses clear the plate.
Delta Parallel Link Rod
A 118 mm link rod for the 'SG90 Mini Delta Pick-and-Place Robot' kit. Print six, lying flat. It has two 18 mm × 8 mm cup bosses exactly 100.0 mm apart. Each boss has a 12.4 mm spherical cup, 5 mm deep with a 0.5 mm chamfered rim, that takes the kit's 12 mm printed split balls, and an 8 mm relief hole that clears the M3x40 bolt head and nut. There are 2.5 mm spring-lug holes 14 mm inboard of each cup for the springs or rubber bands that hold the parallelogram pairs onto the balls.