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.*
Shoulder Wing Root Rocker
This rocker is part of the 'SG90 Scotch-Yoke Flapping Wing Rig' kit, and you print two. The lever is 77 x 16 x 6 mm. It pivots on a shoulder post using an M4x16 screw and an M4 washer, through a 4.5 mm hole in a 16 mm boss that has a 0.5 mm raised thrust ring. The drive link attaches with an M3x16 screw and nyloc nut through a 3.4 mm hole 20 mm inboard. The wing root bolts to two M3 heat-set inserts (4.0 x 5 mm bores) at 30 and 45 mm outboard, which turns the slider's stroke into about ±37° of flap.
Flapper Wing Drive Link
This straight dog-bone link is part of the 'SG90 Scotch-Yoke Flapping Wing Rig' kit, and you print two. It is 46 x 9 x 4.4 mm, with 3.4 mm M3 clearance holes 37.0 mm apart in 9 mm bosses on an 8 mm wide, 4.0 mm stack. The lower end takes an M3x10 into the slider's heat-set insert. The upper end takes an M3x16 with a nyloc through the rocker. Each end has a 6.5 mm, 0.4 mm tall washer ring on opposite faces, so only the rings rub against the slider and the rocker. The whole stack is 4.4 mm and fits the 4.5 mm gap between them.
Yoke Slide Retainer Strip
This flat 12 x 56 x 3 mm strip is part of the 'SG90 Scotch-Yoke Flapping Wing Rig' kit, and you print two. Each one bolts across the top of a spine slide-channel wall with two M3x8 socket head screws into M3 heat-set inserts. The screws go through 3.4 mm holes spaced 40 mm apart, 8.4 mm in from the inner edge. The strip hangs 4 mm over the slider's edge band so the slider can't lift out. It has 3 mm radius ends and a 0.4 mm chamfer on the inner edge so the slider doesn't catch.
Scotch-Yoke Wing Slider
This slider is part of the 'SG90 Scotch-Yoke Flapping Wing Rig' kit. It is a 56 x 26 x 10 mm block with a 40 x 13.5 mm round-ended through-slot. The crank's 624 bearing (4 x 13 x 5 mm) rolls in the slot and turns servo rotation into a ±13.5 mm vertical stroke. A 32 mm wide top tab holds two M3 heat-set inserts (4.0 mm bores, 8 mm deep) 20 mm apart, where the wing drive links bolt on. The 4 mm edge bands on both sides are left flat to slide between the frame pads and the retainer strips.
Servo Horn Scotch Crank
This is the crank for the 'SG90 Scotch-Yoke Flapping Wing Rig' kit. It's a 36 x 16 x 6 mm stadium bar with a sunken seat on the back for a single-arm SG90 horn: a 7.5 mm channel plus a 10 mm centre recess. A 6 mm centre hole gives screwdriver access to the horn screw. At the other end, 12 mm from the axis, a 9 mm boss carries a 624 bearing (4 x 13 x 5) on an M4x20 bolt, which sits in a 4.5 mm clearance bore with a captive M4 nut pocket on the back.
Flapper Spine Frame Plate
This is the 84 x 108 x 5 mm backbone of the 'SG90 Scotch-Yoke Flapping Wing Rig' kit. It has a 12.6 x 24.5 mm through-pocket for an SG90 servo, with solid tab lands so you can drill pilots through your own servo's ears. It also has a 56.8 mm wide slide channel for the yoke slider, with four M3 heat-set bores (4.0 x 6 mm) for the retainer strips, and two 16 mm shoulder posts, each with a gusseted M4 heat-set bore (5.5 x 10 mm), that the wing rockers pivot on. It prints flat on its back face. The bottom 15 mm tongue has two 3.4 mm M3 clearance holes 60 mm apart for the display stand, and lightening windows keep it under 80 cm³.
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.
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.
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.