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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.
Elbow Axle Thrust Collar
A shaft collar for the 8 mm elbow rod in the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit: 32 mm OD, 10 mm tall, with an 8.3 mm bore and a raised thrust ring (11 mm OD, 0.5 mm tall). The ring pushes up only on the inner race of the forearm's lower 608 bearing. It locks with one M3 set screw into an M3 nut that drops into a 5.7 mm slot open at the top. Two grip flats 29 mm apart let you hold it while you tighten.
SCARA Forearm With Elbow Pulley
This is the forearm link of the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit, measuring 159 × 44 × 35.5 mm. Its elbow hub carries two 608 bearings (8 x 22 x 7 mm) in 22.05 mm pockets on the 8 mm elbow rod, and it has a printed 60T GT2 pulley for 6 mm belt (37.69 mm tip OD, 44 mm flanges). A belt-anchor pillar holds both belt ends in 2.2 mm tangential slots, and each end wraps around an M3x16 pin screw held by a captured nut. A ribbed beam runs 120 mm out to a 34 x 34 mm tool pad with four M3 heat-set inserts on a 20 mm square and an 18 mm pen hole.
SCARA Upper Arm Beam
The upper arm link of the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit. It is a 177 x 50 x 22 mm ribbed beam with a 140 mm shoulder-to-elbow span. At the shoulder, an OD 44 pad bolts to the 60T hub with four M3 screws on a 34 mm PCD and has a 10 mm hole for the rod end. The elbow NEMA17 sits on a flat pad with 3.4 x 9.4 mm slots (31 mm square pattern) and a 23 x 29 mm pilot obround, so you can slide the motor ±3 mm to tension the GT2 belt. The elbow end has an OD 22 boss with an 8.3 mm bore for the 70 mm 8 mm rod, held by two M3 set screws in captured nuts, and an OD 11 thrust island underneath that bears on the 608 inner race.
Shoulder 60T Pulley Hub
This rotating shoulder hub is part of the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit. It is a 52 x 44 x 38.5 mm part with a 60T GT2 pulley at the bottom (tip OD 37.69, 8 mm track between 1 mm thick, 44 mm OD flanges) and a 44 mm bolting flange at the top. It runs on two 608 bearings in 22.05 mm pockets (6.5 mm deep at the bottom, 7.2 mm deep at the top) on the base's 8 mm shoulder rod. The top flange takes four M3 heat-set inserts on a 34 mm PCD for the upper arm. A +X lug holds both ends of the open GT2 belt in 2.2 mm slots, each crossed by a 3.4 mm hole for an M3x16 pin screw.
Shoulder Motor Hanger Bracket
A C-shaped bracket from the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit. It hangs the shoulder NEMA17 shaft-up under a 5 mm top plate with a 31 mm square M3 pattern. The M3 holes are 3.4 x 9.4 mm slots and the pilot opening is a 23 x 29 mm obround, so the motor can slide ±3 mm to tension the 3:1 GT2 belt. The part is 59 x 56 x 55 mm. It bolts to the base's 40 x 40 mm heat-set pattern with four M3x10 screws, leaves 45 mm between the foot and the plate for the motor body (motors up to about 44 mm long), and prints lying on its back wall with no supports.
SCARA Base With Shoulder Tower
This is the foundation of the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit. It is a 150 x 110 x 5 mm windowed plate with a raised rim and a 26 mm OD shoulder tower, 60 mm tall, braced by four 40 mm gussets. The tower takes a 100 mm long 8 mm steel rod in a blind 8.3 mm bore, locked by an M3 set screw with a captured nut. A thrust ring (OD 11) carries the 608 inner race. The plate has four M3 heat-set inserts on a 40 x 40 square for the shoulder motor bracket and four 4.5 mm holes for M4 screws into the table.
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.
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.
Cycloid Joint Output Arm
The 141 mm output link for the 'NEMA17 Cycloidal Joint Actuator' kit. It is 8 mm thick and has a pocketed I-section beam. Its Ø50 hub pad bolts to the carrier's M3 heat-set inserts with 4 M3 screws through Ø3.4 holes on a Ø36 circle, and a Ø8 centre relief hole clears the shaft or bearing. The 32 x 32 tip pad 100 mm out has 4 Ø3.4 holes on a 20 x 20 mm square (MGN12H pattern) for a gripper, sensor or the next joint.
Cycloid Retainer Cover Ring
The Ø96 x 6 mm lid ring for the 'NEMA17 Cycloidal Joint Actuator' kit. Its flat underside traps the Ø60 output flange and caps the sixteen 5 x 18 mm steel ring pins. The Ø50.6 bore (chamfered 0.6 mm on top) runs as a plain bearing around the Ø50 output boss. Four M3x30 SHCS pass through Ø3.4 holes on the R42 stack circle and clamp the stack together.
Six-Pin Output Carrier
This is the rotating output flange of the 'NEMA17 Cycloidal Joint Actuator' kit. It has a Ø60 x 6 mm flange that sits under the cover lip and a Ø50 x 9.5 mm boss (15.5 mm tall overall). On the underside it takes a 625 bearing (5 x 16 x 5) in a Ø16.05 x 5.2 pocket and six 5 x 14 mm steel output pins pressed into Ø5.0 x 5.5 blind holes on a 21 mm radius. The top face has four M3 brass heat-set inserts (Ø4.0 x 6) on a Ø36 circle for bolting on the output arm or your own payload.
15-Lobe Cycloidal Disc
The 15-lobe reduction disc (about Ø66 x 9 mm) for the 'NEMA17 Cycloidal Joint Actuator' kit. It rolls against sixteen 5 mm steel ring pins on a 34 mm pitch radius with 1.5 mm eccentricity, giving a 15:1 reduction. Its Ø24.6 chamfered centre bore runs greased on the Ø24 eccentric cam. Six Ø8.4 through-holes on a 21 mm radius drive the six 5 x 14 mm steel output pins of the carrier.
Eccentric Input Cam
This is the input eccentric for the 'NEMA17 Cycloidal Joint Actuator' kit. It clamps onto a NEMA 17's 5 mm shaft through a Ø5.2 bore, using an M3 set screw that threads into a captured M3 hex nut. Its Ø24 lobe sits 1.5 mm off-centre and drives the 15-lobe disc. The part is 30 mm across and 10.5 mm tall, and the Ø30 thrust collar holds the disc up.