Print-ready 3D models

Dovetail Drawer Cell Housing

A 70 × 50 × 130 mm open-front sleeve that holds one drawer in the 'Dovetail-Stacking Parts Drawer Cabinet' kit. Each of its four long faces has an 8/11 mm dovetail groove, so cells can lock to each other in any direction with bowtie keys. Inside are 18 mm ribs, one of which is the drawer rail with a 1.5 mm detent bump. The back plate has two keyholes at ±20 mm (10 mm entry, 5 mm slot) for hanging it on the wall with #8 wood screws. It prints standing on the back plate, so it needs no supports.

Tilt Camera Cradle

The camera cradle for the 'MG996R Heavy Pan-Tilt Camera Gimbal' kit. It is a 60 x 80 x 6 mm U-plate with a 6.8 x 30 mm 1/4"-20 camera slot. On the -Y side, a 5 mm horn cheek bolts to the tilt MG996R's horn through a 12 mm centre hole and eight 3.4 mm radial slots. On the +Y side, an 8 mm cheek has a teardrop 8.3 mm bore for the 8 mm rod that runs to the 608 idler, and an M3 heat-set bore (4.0 mm) for a grub screw that locks the rod. The tilt axis is 32 mm above the plate bottom, and the cheeks are 40 mm wide.

Roller-Track Pan Platter

The rotating pan table for the 'MG996R Heavy Pan-Tilt Camera Gimbal' kit. It is a 6 mm plate made from a 100 mm disc and a 60 x 130 mm bar, and it bolts to the MG996R pan servo horn through a 12 mm centre hole and eight 3.4 mm radial slots. Its flat underside annulus from r = 36 to 48 mm is the track that rides on the three 624 roller forks. Four 4.0 mm bores take M3 heat-set inserts for the tilt uprights. The two +Y bores sit over the roller track, so they are blind: 4.8 mm deep with a 1.2 mm skin underneath, sized for short 4 mm M3 inserts.

624 Roller Thrust Fork

A bolt-down fork that holds one 624 bearing (4 x 13 x 5 mm) on a radial M4x25 axle. It is part of the 'MG996R Heavy Pan-Tilt Camera Gimbal' kit, which uses three of them. The foot is 36 x 22 x 4 mm and fixes to the base deck's M3 heat-sets through two 3.4 mm holes 20 mm apart. The roller top sits 14 mm above the deck, and M3 washers under the foot raise it to 17 mm. The rollers carry the pan platter's weight, so the MG996R's spline doesn't have to.

Pan Servo Base Housing

This is the base of the 'MG996R Heavy Pan-Tilt Camera Gimbal' kit. It is an open-bottom box, 100 x 100 x 48 mm, with a 41.5 x 20.5 mm window in a 4 mm deck. One MG996R pan servo drops into the window and hangs by its tabs, held with M4 screws through four 4.5 mm slots. The deck also has six 4.0 mm M3 heat-set bores for three 624 roller thrust forks on r = 42 mm, and four 4.5 mm M4 bench-screw holes run through full-height corner columns. It prints deck-down with no supports.

Tripod Electronics Deck

Part of the 'MG90S Six-Servo Stewart Platform' kit: a 150 mm round tray with a 2.4 mm floor and a 6 mm lip. Three 10 mm legs, 30 mm tall, sit on outboard lobes at 78 mm radius and take M3 heat-set inserts (4.0 mm bore, 6 mm deep), so the hex base plate bolts on top with M3x10 screws. On the floor are a Pi Zero on 58 x 23 mm M2.5 standoffs with loose nut recesses, a 31 x 31 mm M3 driver-board grid with captive nut pockets, a 30 x 12 mm cable slot and a 12 mm notch for the power lead. The flat underside works as the platform's feet.

Stewart Top Payload Platform

This is the moving top plate of the 'MG90S Six-Servo Stewart Platform' kit. It is 130 mm across and 5 mm thick, with six M3 clearance holes on a 50 mm radius (pairs at 30°, 150° and 270°, ±12°). Each hole has a captive M3 hex-nut pocket, so the ball-stud tabs of the six pushrods bolt on from below with M3x16 screws. The centre has a 31 x 31 mm M3 payload grid with nut pockets. Three triangular windows save weight, and a 4 mm underside ring rib at 58 mm radius stiffens the plate. The rib is cut away wherever a stud tab sits. The plate prints top-face-down with the rib pointing up, so it needs no supports.

Twin Ball-Joint Pushrod

This is the print-in-place 100 mm pushrod for the 'MG90S Six-Servo Stewart Platform' kit (print ×6). It prints as three pieces: a 7 × 12 mm rod with a cupped socket at each end (11.0 mm spherical bore, 7.5 mm throat) and two captive 10 mm ball studs. Each stud has a 4 mm neck and a 12 × 3 mm tab with an M3 clearance hole 9 mm from the ball centre. Bolt one tab to the crank with an M3x16 and a nylock nut, and the other to the platform. The studs spin freely and tilt about ±20° with no loose ball links. Overall size is about 130 × 21 × 14.5 mm.

Slotted Servo Crank Arm

A 37 mm long, 4 mm thick flat crank for the 'MG90S Six-Servo Stewart Platform' kit (print ×6). It fits over a stock MG90S single-arm horn: the horn keys into a 6 mm wide, 1 mm deep recess on the underside and is fixed with two M2 self-tappers through a 2.4 mm radial slot. The slot runs from 6 to 16 mm radius, so the horn's hole spacing doesn't need to be known. A 7.5 mm centre hole clears the horn screw, and a 10 mm tip boss has an M3 clearance hole 24.0 mm from the shaft that takes the pushrod ball-stud tab with an M3x16 screw and a nylock nut.

MG90S Radial Servo Cradle

One of six MG90S servo cradles for the 'MG90S Six-Servo Stewart Platform' kit. It is an L-bracket with a 44 x 20 x 5 mm foot, and two counterbored M3 clearance holes 32 mm apart bolt it to the base plate's heat-set inserts with M3x10 screws. A 4 mm wall with a 23.3 x 12.7 mm window holds the MG90S so its shaft points radially outward, 22 mm above the base. The tab-screw slots take M2 self-tappers at tab spacings from 26 to 30 mm, and two gussets carry servo torque into the foot.

Stewart Hex Base Plate

The foundation of the MG90S Six-Servo Stewart Platform kit. It is a 170 mm round plate, 5 mm thick, with 12 M3 heat-set insert bores (4.0 mm) for six servo cradles in three pairs on a 62 mm radius. It also has three M3 clearance holes on a 78 mm radius for the electronics-deck legs, a 56 mm cable pass-through, and a notched 3 mm underside stiffening rim, and it weighs in at about 90 cm³. It prints top face down with the rim up, so it needs no supports.

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 Tip Anchor Cap

This is the end cap of the 'SG90 Tendon-Driven Continuum Trunk Arm' kit. It is a Ø50 x 4 mm flat-bottomed disc that sits on the dome of the last vertebra. Its blind 4.3 mm bore takes the 4 mm OD PTFE backbone, which you lock with an M3x8 set (grub) screw in a radial 2.6 mm hole at z=8. You drive that screw with a hex key through a 3.4 mm access tunnel in the +X boss. Three 1.8 mm tendon holes at R20 take 0.8–1.0 mm braided line, and each has a Ø4 knot counterbore on top. Two Ø9 bosses at ±14 mm hold M3 heat-set inserts (4.0 x 6 mm bores). Their tops are flush with the Ø14 centre boss at z=18, so a payload bolts onto one flat plane.

Rolling-Dome Trunk Vertebra

A Ø50 x 3 mm spine disc for the 'SG90 Tendon-Driven Continuum Trunk Arm' kit, printed ×8. It has a Ø12 hub topped by a R7.5 rolling dome with its apex at 12 mm, which sets the 12 mm stacking pitch. The 4.6 mm bore rides loosely on the 4 mm OD PTFE backbone so each segment can tilt. Three chamfered 1.8 mm holes at R20 guide the 0.8–1.0 mm braided tendons, and three Ø10 lightening holes keep each disc to about 6 cm³.

Trunk Root Plate

This is the root plate of the 'SG90 Tendon-Driven Continuum Trunk Arm' kit: a Ø76 x 8 mm disc that bolts to the tower's top flange with 3x M3 at R34. It clamps the 4 mm OD PTFE backbone in a 4.3 mm bore, locked by an M3x8 set screw threaded into a radial 2.6 mm hole on +X at mid-height. It also has three 4.3 mm x 6 mm Bowden tube sockets at R20 that open downward and step into 1.8 mm tendon holes. The first rolling dome, a Ø12 hub with an R7.5 cap, peaks 9 mm above the plate top.

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.

Arm Clamp Pen Collar

This collar is part of the 'NEMA17 Hanging Wall Polargraph Drawbot' kit. It is a 34 mm OD x 10 mm knurled ring, and its 22.4 mm bore slides over the gondola hub's 22 mm pen sleeve to hold the two line arms in place. One M3 heat-set insert goes in a 4.0 mm radial bore in a flat 14 mm pad. An M3x16 thumbscrew in that insert passes through the sleeve slot to clamp the pen and lock the collar with one turn.