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.*
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.
Tray Ball-Stud Knuckle
An L-bracket (34 x 27 x 18 mm) that carries the Ø10 mm snap ball stud under the 150 mm tray. It is part of the 'SG90 3-DOF Ball-Balancing Platform' kit (print ×3). The 5 mm flange has two 3.4 x 7 mm slots, 24 mm apart, for M3x10 SHCS going into the tray's M3 heat-set bosses. The ball centre is 16 mm from the mating face, so the Snap-Socket Linkage Rod clips straight on.
Snap-Socket Linkage Rod
A flat link, 87 x 17 x 8 mm, with two snap sockets 70 mm apart (centre to centre). Print ×3 for the 'SG90 3-DOF Ball-Balancing Platform' kit. Each Ø17 mm ring has a Ø8.6 mm bore with a Ø10.4 mm double-cone band in the middle and a 1.5 mm split slot, so it clips over the Ø10 mm ball studs on the SG90 Ball-Stud Crank Arm and the Tray Ball-Stud Knuckle without screws. PETG is recommended so the rings flex without cracking.
SG90 Ball-Stud Crank Arm
A 36 x 16 x 5 mm servo crank with a built-in Ø10 mm snap ball stud 20 mm from the shaft, printed ×3 for the 'SG90 3-DOF Ball-Balancing Platform' kit. It sits on top of the stock SG90 single-arm horn. The horn screw goes through the Ø7 mm hub bore, and two M2 screws go through the 2.4 mm slot (5–15 mm from the shaft) into the horn's own holes. The Snap-Socket Linkage Rod then clips onto the ball.
SG90 Side-Shaft Servo Cradle
This L-shaped cradle is part of the 'SG90 3-DOF Ball-Balancing Platform' kit (print ×3). It holds one SG90 micro servo with its shaft horizontal. The servo body goes through a 12.4 x 22.8 mm window in a 5 mm wall, and the tabs rest flat against the wall's outer face, with 2.4 mm slots for the M2 tab screws. The 32 x 40 x 5 mm foot bolts to the Tri-Spoke Servo Base Plate with two M3x12 SHCS through 3.4 mm holes spaced 30 mm apart. Two gussets brace the 51 mm wall, and each has a notch so the screw heads can go in from above.
Tri-Spoke Servo Base Plate
This is the Ø160 x 5 mm foundation plate for the 'SG90 3-DOF Ball-Balancing Platform' kit. It has three spokes at 90°, 210° and 330°, and each spoke holds one SG90 servo cradle with two M3x12 SHCS. The M3 holes are 3.4 mm, at radius 30 and 60 mm, with captured M3 hex-nut pockets (5.7 mm AF x 2.6 mm deep) on the underside. In the centre, a 3x3 grid of M3 holes on a 20 mm pitch takes standoffs for a PCA9685 or Arduino. Three rounded cut-outs bring the plate under 80 cm³ while keeping 6 mm webs and an 8 mm outer ring.
Print-In-Place M5 Heim Rod End
This rod end prints in one go with a 16 mm ball already captured inside a 23 mm eye. The ball has a 5.5 mm M5 clearance bore. The 46 mm body has an in-line 5.5 mm bore and a drop-in M5 nut pocket, so it threads onto M5 rod. It's meant as a cheap, repeatable ball link for Stewart platforms, delta arms and parallel-kinematic robots, where you'd otherwise be press-fitting loose balls into printed sockets.