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.*
Pen Lift Clamp Slider
This slider is part of the 'NEMA17 Cantilever Pen Plotter' kit. The 34 x 18 x 16 mm block runs on two 4 mm steel guide pins, 24 mm apart, through 4.4 mm slip bores. It holds any 7–12 mm pen in a 12.5 mm bore, clamped by an M3x12 screw and a captured M3 hex nut. An SG90 servo horn pushes up on the 12 x 14 x 5 mm lift tab to raise the pen. The two guide pins stop the wobble and drag you get when the lifter hangs from the servo alone.
Pen Lift Guide Frame
This C-frame is the pen-lift guide for the 'NEMA17 Cantilever Pen Plotter' kit. It bolts to the pen shuttle's M3 heat-set grid (20 x 20 mm) with four M3x10 screws. Two 4 x 55 mm steel guide pins press into its 6 mm arms 24 mm apart, and a 16 mm pen pass hole runs between them. An SG90 servo fits a 23.5 x 13 mm window with slotted tab holes that take 26–31 mm tab spacing. The frame measures 78 x 58 x 25 mm and prints flat on its backplate with no supports.
150 mm Balance Tray Platform
This is the moving Ø150 x 3 mm top tray for the 'SG90 3-DOF Ball-Balancing Platform' kit. Its smooth playing surface prints face-down on the bed. On the underside, six Ø9 mm bosses stand 6 mm proud at radius 43 and 67 mm on the 90°/210°/330° spokes. Each takes an M3 brass heat-set insert (4.0 mm bore, 5.5 mm deep, blind) so the three Tray Ball-Stud Knuckles can bolt on with M3x10 SHCS. Three 3 x 6 mm radial ribs, a Ø24 mm hub ring and a 2.4 mm outer ring stiffen the tray so the PID loop sees no flex.
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.
Gripper Idler Jaw
This is the idler finger of the gear-meshed gripper, part 8 of the 'SG90 Four-Axis Desktop Robot Arm' kit. It is a flat jaw 6 mm thick and 62 mm long that turns on an M3x20 pivot bolt through a Ø3.4 bore in a Ø20 hub. The hub carries a module 1.0, 20° involute sector: six teeth on a Ø20 pitch circle (tip Ø22, root Ø17.5), with a tooth gap centred toward the drive jaw so the two mesh at a 20 mm centre distance. The finger doglegs in to a ridged grip face that closes 3 mm from the drive jaw's face.
Gripper Drive Jaw
This is the servo-driven finger, part 7 of the 'SG90 Four-Axis Desktop Robot Arm' kit. It is a flat jaw, 6 mm thick and about 74 mm long. Its hub carries a module 1.0 gear sector: 7 involute teeth at 20° pressure angle on a Ø20 pitch circle (tip Ø22), meshing with the idler jaw at a 20 mm centre distance. The underside has a 1.8 mm pocket that takes an SG90 single-arm horn, plus a Ø5.3 hole for the horn screw. The finger doglegs inward to a flat grip face with ridges at a 3 mm pitch.
Gripper Servo Palm
This palm is part 6 of the 'SG90 Four-Axis Desktop Robot Arm' kit. It is a 65 x 52 x 5 mm plate that holds the gripper SG90 servo in a 28 x 12.6 mm window with M2 ear slots, which puts the drive-jaw axis at (-10, 0). The M3 idler-jaw pivot runs in a 3.4 mm slot with 5 mm of travel on a raised 2 mm washer pad, so you can set the 20 mm gear mesh. The palm bolts to the forearm tip with two M3 screws through Ø3.4 holes 15 mm apart.
Forearm Wrist Link
This is the elbow-to-wrist link of the 'SG90 Four-Axis Desktop Robot Arm' kit. It is a flat bar 5 mm thick and 18 mm wide, 83 mm long from the elbow axis to its rounded tip. The Ø26 × 6 mm elbow hub screws to an SG90 double-arm horn. The horn sits in a 7.5 × 36 × 1.8 mm pocket that has a short rear lobe so the slot is fully walled, with a Ø5.3 hole for the horn screw. The flat wrist end carries the gripper palm on two M3 bolts through Ø3.4 holes 15 mm apart, at 60 and 75 mm from the elbow axis. Their M3 nuts sit in 5.7 mm captured hex pockets on the underside.
Upper Arm Elbow Link
This is the shoulder-to-elbow link of the 'SG90 Four-Axis Desktop Robot Arm' kit. It is a 5 mm flat bar, 22 mm wide, 80 mm between axes and 119 mm long overall. The Ø24 × 9 mm shoulder hub has a double-arm SG90 horn pocket on the bottom face (7.5 × 36 × 1.8 mm, Ø5.3 screw hole) and a Ø16.05 × 5 mm press-fit pocket on top for a 625 bearing (5 × 16 × 5), with a 2.2 mm web between them. The elbow end has a 28 × 12.6 mm SG90 window with M2 ear slots, which puts the elbow servo shaft at 80 mm.
Yaw Turntable Shoulder Yoke
This is the Ø84 x 5 mm yaw turntable for the 'SG90 Four-Axis Desktop Robot Arm' kit. It screws to the yaw servo's double-arm SG90 horn through a 1.8 mm underside pocket with a Ø5.3 centre hole. It also has an upright 5 mm wall with a 28 x 12.6 mm SG90 window and M2 ear slots, which puts the shoulder axis 38 mm above the underside. Two gussets brace the wall, and two Ø9 bosses carry Ø4.0 x 6 mm M3 heat-set bores at (22, ±14) for the 625-bearing idler cheek.
SG90 Arm Base Pedestal
The base and yaw-servo housing of the 'SG90 Four-Axis Desktop Robot Arm' kit. It is a hollow 100 x 100 x 40 mm pedestal with a 5 mm top deck. The deck has a 28 x 12.6 mm SG90 window with 2.4 mm M2 ear slots, which puts the yaw shaft at the deck centre. It screws down with four #8 wood screws through Ø4.8 holes in corner columns on an 84 mm square, and a 14 x 8 mm notch lets the servo cable out.
Tilt Axis Idler Pivot Post
This is the idler pivot post for the 'SG90 Animatronic Eye Mechanism' kit. The tilt paddle's left arm turns on an M3x16 SHCS, M3 washer and M3 nylock through the post's Ø3.4 hole at y -45, z 30, directly across from the SG90 tilt servo. The wall is 6 mm thick with a flat inner face and a rounded top, and two gussets brace it. The 4 mm foot (about 20 × 34 × 40 mm overall) has a 3.4 mm slot with end centres 20 mm apart. Two M3x10 SHCS and nuts go through deck holes (-60, -40) and (-60, -50), and the slot lets you slide the post ±5 mm to line it up with the servo shaft. Fit the foot screws without washers so the heads clear the gussets.
SG90 Tilt Servo Tower
An upright tower that holds an SG90 micro servo on its side as the tilt axis of a pan-tilt head. It has a 23 x 12.6 mm through-window for the servo body, slotted tab holes so the tab screws still fit if the spacing varies a little, and a 44 mm tall wall braced by two gussets. The foot has three M3 clearance holes (3.4 mm) for bolting it to a pan plate or chassis deck.
Twin-Slot Eye Tilt Paddle
The U-shaped tilt rocker (96 × 37 × 18 mm, black) for the 'SG90 Animatronic Eye Mechanism' kit. It pivots on the y -45 / z 30 axis between an SG90 horn and an M3x16 idler pivot. Its 3 mm crossbar has two 22 × 4.2 mm rounded slots on a 60 mm pitch that steer the M3x35 eye-stalk screws. The right arm has a flat outer face for the stock SG90 horn (2 servo self-tappers) and a Ø7 hole for screwdriver access. The left arm has a Ø3.4 hole for an M3x16 SHCS, washer and nylock.
Pan Scotch-Yoke Tie Bar
This is the red tie bar for the 'SG90 Animatronic Eye Mechanism' kit. It is 74 × 30 × 5 mm and connects both eye-yoke pan levers through Ø3.4 holes on a 60 mm pitch, using M3x8 SHCS and M3 washers. Its centre tongue has a 2.6 mm slot (end centres 14 mm apart) with 0.4 mm chamfers on both faces. The M2x16 pin on the SG90 pan horn runs in this slot, forming a scotch yoke that pans both eyes together.
Animatronic Eyeball
A Ø30 mm eyeball for the 'SG90 Animatronic Eye Mechanism' kit (print ×2). It prints standing on its flat Ø25.4 mm rear face. The side flats sit 29 mm apart and each has a Ø2.6 × 8 mm self-tap bore for the M3x12 SHCS tilt pins through the gimbal yoke. A Ø2.6 × 12 mm rear bore takes the M3x35 stalk screw that the tilt paddle steers. On the front is a dished Ø12 mm iris and a Ø5 mm pupil recess, ready for paint or a sticker.
Eye Gimbal Pan Yoke
A U-shaped gimbal yoke for the 'SG90 Animatronic Eye Mechanism' kit (print ×2). Each yoke holds one 30 mm eyeball so its pan and tilt axes cross at the centre of the eye. The 41 × 10 × 5 mm bottom bar pivots on the deck using an M3x16 SHCS, a washer and an M3 nylock through a Ø3.4 bore. The two 5 mm uprights have Ø3.4 tilt holes at z 29.5, 31 mm apart on their inner faces, and take M3x12 SHCS that screw into the eyeball. A +Y lever with an R7 pad has a Ø2.6 self-tap hole 20 mm from the pivot for the M3x8 tie-bar screw.
Animatronic Eye Deck Plate
This is the 140 x 150 x 3 mm base deck for the 'SG90 Animatronic Eye Mechanism' kit. It has a 10 mm grid of Ø3.4 M3 clearance holes, with the eye-yoke pan pivots at (±30, 0). There is a 12.6 x 23.0 mm through-pocket for the SG90 pan servo, plus slotted tab holes for its M2x8 screws and nuts. Underneath, 25 mm corner legs and 3 x 6 mm ribs keep the servo body and the M3 screw heads and nuts off the table. The part prints top-face-down with no supports.