Print-ready 3D models

Micro Servo And Horn Sorting Caddy

A 137 x 70 x 18 mm drawer caddy for spare servos. It has ten 25 x 14 mm upright pockets, 16.4 mm deep, sized for 9 g micro servos (SG90 / MG90S class, body about 23 x 12.5 mm): each servo stands with its mounting tabs on the rim and its lead hanging over the edge. Along the front are three 43 x 32 mm scooped bins for loose horns, horn screws and spline adapters.

Bowden Tendon Guide Block

This guide block is part of the 'SG90 Tendon-Driven Continuum Trunk Arm' kit (print ×3). It takes a 4 mm OD PTFE Bowden tube in a horizontal 4.3 mm bore, 22 mm deep, at z = 8. The bore steps down to a 1.8 mm chamfered fairlead for the 0.8–1.0 mm braided tendon, which keeps the line aimed straight from its capstan into the tube. The block is 30 x 12 x 14 mm. Its 5 mm side ear has a 3.4 mm hole and clamps in the deck's radial slot with an M3x12 screw, a washer and a nut, so you can slide it and swivel it into line.

SG90 Tendon Capstan Drum

This capstan drum is part of the 'SG90 Tendon-Driven Continuum Trunk Arm' kit (print ×3). It keys onto the SG90's stock single-arm horn through a 7.5 x 2.5 mm underside slot and is held by an M2x10 screw that goes through a 2.4 mm hole with a Ø4.5 counterbore. A 0.8–1.0 mm braided tendon ties through a 1.8 mm cross hole in the Ø20 groove, which pulls in 31 mm of line per 180°. The drum is 12 mm tall with Ø28 flanges, and 45° chamfers on the flanges keep the line in the groove.

Trunk Tower Column

Hollow riser for the 'SG90 Tendon-Driven Continuum Trunk Arm' kit. It is a 60 mm OD tube with a 2.4 mm wall and stands 70 mm tall. The Ø84 mm base flange bolts to the servo deck with 4x M3 on a 36 mm radius. The Ø76 mm top flange carries the root plate on 3x M3 at R34, with 5.7 mm hex nut pockets underneath. Three 28 mm pointed-arch windows let the Bowden tubes and wiring pass through. It prints upright with no supports.

Trunk Servo Base Deck

This is the foundation of the 'SG90 Tendon-Driven Continuum Trunk Arm' kit. It is a Ø140 mm deck, 3.5 mm thick, with a 32 mm skirt that has a 2 mm wall. It holds three SG90 micro servos in 22.8 x 12.4 mm through-pockets on a 52 mm radius. Each pocket has 2.4 mm M2 tab slots that cover 26–30 mm tab spacing. The trunk tower bolts to the deck with 4x M3 through 3.4 mm holes on a 36 mm radius, with captured 5.7 mm hex nut pockets under the deck. The deck also has a Ø44 wire pass-through, three 3.4 mm radial slots (R46–R60) for the Bowden guide blocks, six lightening windows and three 16 x 10 mm cable notches in the skirt. It prints upside down with no supports, and the hole pattern is mirror-symmetric, so it reads the same either way up.

Biped Rolling Foot Plate

Black 90 x 58 x 3 mm foot sole with a 36 mm wide, 6 mm thick horn upright, part of the 'SG90 Parallelogram-Leg Biped Walker' kit. An SG90 horn fits flat against the rear face, with its hub in a 5.5 mm vertical slot. Two M2x10 self-tapping screws go through 2.4 mm slots (r = 5–16 mm), which come in three rows at 30, 34 and 38 mm above the sole for height adjustment. The ankle block has space to roll ±20° behind the upright. Print two, one mirrored in Y.

Ankle Roll Servo Block

This is the ankle block for the 'SG90 Parallelogram-Leg Biped Walker' kit, 44 x 24 x 58 mm. An SG90 ankle-roll servo sits upright in a 23.6 x 12.8 mm front-wall window, held by two M2x10 screws and nuts through tab slots. A 6 mm lug on top has two 3.4 mm pivot holes 32.0 mm apart for the leg links, fastened with M3x20 screws and nyloc nuts. Prints upright with no supports, and one design fits both legs.

Parallel Follower Leg Link

This is the passive follower link for the 'SG90 Parallelogram-Leg Biped Walker' kit. It is 74 x 14 x 6 mm, has full-round R7 ends and two 3.4 mm pivot holes exactly 60.0 mm apart, and a 1.5 x 8 mm stiffening rib runs between them. The top end bolts to the torso's I4 slot and the bottom end to the ankle lug's inboard face, each with an M3x20 socket head screw, washers and an M3 nyloc nut, so the ankle stays level as the leg swings.

Hip Horn Drive Link

Red 87 x 40 x 6 mm drive link for the 'SG90 Parallelogram-Leg Biped Walker' kit. A 40 mm horn pad holds an SG90 horn with two M2x10 self-tapping screws through 2.4 mm radial slots (r = 5–16 mm) around a 5.5 mm centre hole. 60.0 mm away, a 14 mm boss has a 3.4 mm hole for the M3x20 pivot screw and nyloc nut into the ankle lug. Print two and flip one for the other leg.

Biped Electronics Battery Deck

This black 80 x 70 x 3 mm top deck is part of the 'SG90 Parallelogram-Leg Biped Walker' kit. It bolts onto the Biped Hip Servo Torso's heat-set posts with four M3 screws through 3.4 mm holes on a 64 x 52 mm rectangle. It carries a 4xAA battery holder, strapped on with a zip tie, and a controller on standoffs that screw into a 5 x 5 grid of 3.4 mm holes at 10 mm pitch. A 3 x 4 mm stiffening lip on the underside stops the deck warping or flexing and stays clear of the torso posts. A 30 x 8 mm pass-through carries the servo wires.

⚠ Flagged: battery or DC power. Not for safety-critical use without independent engineering review.

Biped Hip Servo Torso

An 80 x 70 x 32 mm open torso frame for a small biped robot. Both side walls have a 23.6 x 12.8 mm window with tab slots for a micro-servo (SG90 size) to drive each hip. Each side wall also has an M3 pivot hole for a follower link. The top deck has four 4.0 mm bores for M3 heat-set inserts, and the base plate has a lightening cutout to save weight.

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.

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.

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.

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.

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.