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Delta Parallel Link Rod
A 118 mm link rod for the 'SG90 Mini Delta Pick-and-Place Robot' kit. Print six, lying flat. It has two 18 mm × 8 mm cup bosses exactly 100.0 mm apart. Each boss has a 12.4 mm spherical cup, 5 mm deep with a 0.5 mm chamfered rim, that takes the kit's 12 mm printed split balls, and an 8 mm relief hole that clears the M3x40 bolt head and nut. There are 2.5 mm spring-lug holes 14 mm inboard of each cup for the springs or rubber bands that hold the parallelogram pairs onto the balls.
Delta Upper Arm
The servo-driven upper arm for the 'SG90 Mini Delta Pick-and-Place Robot' kit. Print three, lying flat. A 22 mm × 7 mm solid pad with a 5.5 mm centre hole goes on the SG90 horn, and you drill 1.5 mm pilots through the horn holes for the horn's own self-tapping screws. A 12 × 7 mm beam runs 50.0 mm to a 14 mm OD × 8.0 mm boss with a 3.4 mm hole for the M3x40 ball-joint stack. A scribed centreline helps you level the arm.
SG90 Delta Servo Cradle
An L-bracket SG90 servo cradle for the 'SG90 Mini Delta Pick-and-Place Robot' kit; print three. It has a 44 × 35 × 5 mm pad and a 24 mm tall wall with a 23.6 × 12.8 mm window for the SG90's 23 × 12.2 mm body. The tab slots take M2 screws and nuts, and two gussets carry the arm torque. The pad hangs from the top plate on M3x10 SHCS into captured M3 nuts, with ±4 mm of radial adjustment.
Delta Servo Top Plate
A 5 mm thick tri-lobe top plate for the 'SG90 Mini Delta Pick-and-Place Robot' kit, about 161 × 162 mm. Three 32 mm column pads at radius 75 mm have 20.6 mm × 1.5 mm locating recesses on the underside and 3.4 mm holes for M3x10 SHCS into the columns' heat-set inserts. Each of the three servo lobes has a pair of 3.4 mm slots, each giving ±4 mm of radial travel, so the SG90 cradles can be adjusted on M3x10 screws. The lobes also have an arm-swing notch, and the hub has a 30 mm wiring hole with a zip-tie slot pair.
Delta Base Foot Plate
This is the 5 mm thick tri-star foundation for the 'SG90 Mini Delta Pick-and-Place Robot' kit. It has a 90 mm work pad carrying a 6 x 6 grid of 3.4 mm M3 fixturing holes at 10 mm pitch. Three 26 mm ribs join the pad to 32 mm round column feet at radius 75 mm (60°/180°/300°). Each foot has a 20.6 mm x 1.5 mm locating recess for the 20 mm columns and a 3.4 mm through-hole. On the underside, a 6.2 mm counterbore sits each M3x10 SHCS head flush, so the plate stands flat.
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 Socket Display Stand
This is the display foot for the 'SG90 Scotch-Yoke Flapping Wing Rig' kit. The base is 140 x 100 mm with a 6 mm stiffening rib and lightening windows. The socket block is 96 x 17.5 x 22 mm, with an 85.0 x 5.5 x 15 mm slot that the spine plate's bottom tongue drops into. Two M3x25 bolts with M3 hex nuts lock the spine in place. They pass through 3.4 mm holes at X ±30, and the nuts sit in pockets (5.7 mm across flats) on the back wall.
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.
SCARA Pen Clamp Lift Slider
This pen carrier is part of the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit. It is a 24 x 24 x 32 mm block that slides in the SG90 tool head's 24.8 mm channel with 0.4 mm of clearance per side. It has a 14.6 mm pen bore and an M3 side clamp that uses a captured M3 nut in a 5.7 mm slot, so it holds pens from 8 to 14 mm. A 16 x 6 mm lug sticks out 7 mm from the +Y face so the servo horn can push it up from below.
SG90 Pen Lift Tool Head
The pen-lift tool head for the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit. It is 39 x 60 x 54 mm. A 34 x 60 x 5 mm top plate bolts under the forearm tool pad with four M3 screws into heat-set inserts on a 20 x 20 mm square, through 3.4 mm holes. There is a 16 mm pen hole in the middle. Below it hangs a square guide channel for the pen slider: 24.8 mm inside, 2.4 mm walls. The +Y wall has an 18 mm lug slot, and 3.4 mm cross holes take an M3x35 retainer. A gusseted 4 mm plate holds an SG90 servo in a 22.8 x 12.4 mm window. Its tab notches fit screw spacings from 26 to 29 mm, so the horn swings just outside the slot and lifts the slider lug.
SG90 Twin-Groove Tendon Spool
A two-groove tendon spool that screws onto an SG90/MG90S servo horn. It pulls a flexor line in one groove and lets out an extensor line in the other, so one servo drives a tendon finger both ways. It is 37 mm across and 22 mm tall, with 16 mm drums, a Ø7.5 mm bore so a screwdriver reaches the horn screw, a Ø9 mm recess for the horn hub, M2 clearance holes at radii of 12 and 15 mm on four arms, and Ø1.6 mm tie-off holes.
Four-Finger Palm With Thumb Clevis
The palm of the 'SG90 Tendon-Driven Robot Hand' kit. It is a 90 x 80 x 8 mm plate with a thenar lobe that bolts to the Five-Servo Forearm Deck with 4x M3x16 bolts and nuts through Ø3.4 mm holes. Four finger knuckle clevises and one side thumb clevis each take an M3x20 socket head bolt and nylock nut as the pin, with 6.6 mm gaps for the 6 mm digit tongues. Extensor grooves are cut into the underside and slotted flexor ribs sit on top at 17 mm, so the 0.5 mm nylon tendons run to each finger at their fixed heights.
Wrist Tendon Guide Comb
Upright 80 x 20 x 24 mm comb for the 'SG90 Tendon-Driven Robot Hand' kit. It bolts to the Five-Servo Forearm Deck with 2x M3x10 bolts and nuts through Ø3.4 mm holes at (112, ±20), and runs 10 tendons of 0.5–0.8 mm nylon line through Ø2.0 mm guide holes. The guide holes sit at the flexor height (17 mm) and extensor height (5 mm) for each finger lane. Each hole has a 45° countersink widening to Ø5 on the spool side, so lines that come in at an angle don't fray on a sharp printed edge.
Five-Servo Forearm Deck
A 150 x 166 mm ribbed forearm deck that holds five SG90-class micro servos side by side at 36 mm pitch to drive the tendons of a five-finger robot hand. It has 23.4 x 12.6 mm servo pockets with open ear slots that accept a range of M2 tab-screw spacings, M3 clearance holes (3.4 mm) for a tendon comb and wrist mount, a 32 mm skirt with a 2 mm wall, and a cable notch.
SG90 Tibia Foot Link
The lower leg and foot for the 'SG90 18-DOF Hexapod Walker' kit (print 6). It is a tapered link 90 x 20 x 6 mm. It fits an SG90/MG90S single-arm horn in a 1.5 mm recess (a 9 mm circle plus a 6.5 mm slot to 19 mm), and a 6 mm hole gives access to the horn screw. You fix the horn with M2x6 self-tappers drilled through its own holes. The foot tip sits 80 mm from the pivot, has a 5 mm radius and 1 mm chamfers so it rolls cleanly, and a 5 x 36 mm slot takes out weight.
SG90 Femur Thigh Servo Link
The thigh (femur) link for the 'SG90 18-DOF Hexapod Walker' kit (print 6). It is a flat 81 x 22 x 4 mm link. The pivot end screws to an SG90/MG90S horn using M2x6 self-tappers: there is a 6 mm through-hole, and a 1.5 mm deep recess (a 9 mm circle plus a 6.5 mm slot) keeps the horn from turning. The other end holds the tibia SG90/MG90S servo in a 23.4 x 12.8 mm pocket 50 mm from the pivot. Its slotted M2 tab slots take tab hole spacings from 26 to 31.6 mm.
SG90 Coxa Hip Yoke Bracket
The hip yaw link for the 'SG90 18-DOF Hexapod Walker' kit (print 6). It is an L-bracket 66 x 18 x 36 mm. The 4 mm base screws to the hip servo's horn through a 6 mm pivot hole, and a 1.5 mm horn recess (a 9 mm circle plus a 6.5 mm slot) keeps the horn from turning. The 4 mm wall holds the femur SG90/MG90S servo in a 23.4 x 12.8 mm pocket, 28 mm outboard and 17 mm above the horn face. Its slotted M2 tab slots fit tab spacings from 26 to 31.6 mm, with M2x10 screws and nuts.
2S 18650 Strapped Battery Tray
The battery tray for the 'SG90 18-DOF Hexapod Walker' kit. It is a 46 x 76 x 16 mm open tray with a 40 x 70 mm cavity that holds a side-by-side 2S pack of two 18650 cells (18.4 x 65 mm each) with room for the BMS leads. Four M3 holes at (±10, ±30) have captured M3 hex-nut pockets, so M3x10 screws from under the deck hold it on. A 20 mm hook-and-loop strap goes through the 22 x 3 mm wall slots and under the pack, and a 10 x 8 mm notch lets the leads out.
Flagged: battery or DC power. Not for safety-critical use without independent engineering review.
Hexapod Standoff Electronics Deck
The upper electronics deck for the 'SG90 18-DOF Hexapod Walker' kit. It is a 64 x 110 x 3 mm plate with 20 mm corner chamfers and a full 45-hole M3 grid (3.4 mm holes on a 10 mm pitch). Four M3x30 F-F standoffs and M3x8 screws hold it 34 mm above the chassis. The 2S 18650 battery tray bolts on with M3x10 screws, and four 4 x 20 mm slots take zip ties for the servo controller and wiring. The plate stays inside ±32 mm in X, so the coxa brackets can swing freely.
Hexapod Chassis Base Plate
The main body of the 'SG90 18-DOF Hexapod Walker' kit: a 164 x 124 x 4 mm plate with 30 mm corner chamfers and six SG90/MG90S hip-servo pockets (23.4 x 12.8 mm). Each pocket has slotted M2 tab slots that take tab hole spacings from 26 to 31.6 mm, so one plate fits most micro servos. It also has four 3.4 mm M3 standoff holes at (±20, ±30) for M3x30 standoffs to the deck, a 24 x 40 mm central wiring pass-through, and front and rear cable slots. It uses about 61 cm³ of material.