Print-ready 3D models

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 Frame Column

One of three 20 mm OD × 150 mm hollow columns for the 'SG90 Mini Delta Pick-and-Place Robot' kit. Each column sets the fixed distance between the base plate and the servo top plate. Each end has an 8 mm solid plug with a 4.0 × 6 mm bore for an M3 brass heat-set insert, and is fastened with an M3x10 SHCS through the plate. A 0.6 mm chamfer on each end lets the column seat fully in the plates' 20.6 mm locating recesses, and there are three 1 mm decorative flutes.

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.

70 mm Clamp-Hub Rover Wheel

This direct-drive wheel is part of the 'NEMA17 Rocker-Bogie Mars Rover Chassis' kit (print ×6). It is 70 mm OD × 26 mm wide, with a 2.5 mm rim shell, 18 grouser tread bars 3 mm wide and 2 mm tall, and a 3 mm face disc with 6 spoke windows. The 16 mm hub has a 5.3 mm bore for a NEMA17's 5 mm shaft. An M3 screw 5 mm from the hub face clamps the shaft and threads into an M3 hex nut captured in a 5.7 mm slot that is open at the top. A 6 mm hole through the rim lines up with the screw so a hex key can reach it.

Differential Cross-Pin Link

Link for the 'NEMA17 Rocker-Bogie Mars Rover Chassis' kit (print ×2). It has 40 mm between hole centres and joins the 625 differential bar end to the rocker ear. End A is a 12 mm OD × 6 mm eye with a vertical 3.4 mm hole. End B is a 10 × 12 × 12 mm boss with a 3.4 mm cross-hole along Y, 6 mm up. The two hole axes are perpendicular, so the link works as a cardan-style joint. Each end takes an M3x25 bolt with a nyloc nut and washers.

625 Differential Rocker Bar

This is the differential bar for the 'NEMA17 Rocker-Bogie Mars Rover Chassis' kit. It is a 172 × 28 × 8 mm bar that pivots under the deck on an M5x25 bolt. A 625 bearing (5 × 16 × 5 mm) press-fits into a 16.05 mm pocket in the 28 mm hub. Each end at ±80 mm has a 3.4 mm eye for the M3x25 cross-pin links, so the bar averages the two rocker angles and keeps the deck level.

Twin-Motor Bogie Arm

The rear bogie arm for the 'NEMA17 Rocker-Bogie Mars Rover Chassis' kit (print ×2; the arm is symmetric, so one print fits either side). It is an 8 mm thick flat plate, 126 × 64 mm. A 22.05 mm bore takes a press-fit 608 bearing on the M8x35 bogie pivot bolt. Two 46 × 46 mm NEMA17 pads, 80 mm apart, each have a 31 mm square of 3.4 mm holes for M3x12 screws and a 22.5 mm pilot hole. The two top outer corners are chamfered 8 mm so the arm clears the rocker as it swings.

Rocker Arm With 608 Pivot

This is the main suspension rocker for the 'NEMA17 Rocker-Bogie Mars Rover Chassis' kit (print ×2). Both faces are identical, so the same print works on the left and right sides. It is an 8 mm thick flat arm about 154 × 104 mm. The main pivot is a 22.05 mm through-bore that takes a press-fit 608 bearing on an M8x40 bolt. The front NEMA17 pad has four 3.4 mm M3 holes on a 31 mm square and a 22.5 mm pilot hole. The bogie pivot boss has an 8.4 mm hole for the M8x35 bolt, and the differential ear has a 3.4 mm hole for an M3x25 link bolt.

M8 Rocker Pivot Pillow Block

Pivot block for the 'NEMA17 Rocker-Bogie Mars Rover Chassis' kit (print ×2). It carries the M8x40 rocker pivot bolt in an 8.4 mm teardrop bore 13 mm above the deck. It bolts to the deck grid with four M3x16 screws and hex nuts on a 40 × 20 mm pattern, through a 50 × 34 × 6 mm flange. The 24.5 mm tall rounded upright has two 45° gussets.

Rover Grid Deck Plate

This is the main 150 x 172 x 5 mm deck of the 'NEMA17 Rocker-Bogie Mars Rover Chassis' kit. It has a 20 mm pitch grid of 3.4 mm M3 through-holes, so electronics can mount anywhere with M3 screws. It has solid landing pads for the two M8 pillow blocks (M3x16 bolts with hex nuts under the deck), a 5.5 mm hole at (50, 0) for the M5x25 differential pivot, and a 3 mm stiffening lip around the edge. There are 44 lightening windows, each about 12 x 12 mm, to keep the weight down.

Print-In-Place 7-Link Track Strip

A 7-link, 12 mm-pitch print-in-place track strip, 28 mm wide and about 92 mm long, for the 'N20 Twin-Track Mini Tank Chassis' kit. Print 8 and join 4 into each 28-link loop. Each link has 8.4 mm knuckles and an integral 4 mm pin running in a 5 mm teardrop bore, plus a 5.6 x 7.6 mm window that the 12T sprocket teeth drive through. The strips join with M3x8 SHCS inserted from each track edge, passing through the last link's 3.4 mm bore and threading into the first link's 2.6 mm self-tap pilot.

Track Keel Skid Rail

A 40 mm long bolt-on skid rail (print 2) for the 'N20 Twin-Track Mini Tank Chassis' kit. It holds the lower run of the 12 mm-pitch track down between the drive and idler axles, and a 10 mm wide keel rides in the links' centre band. It attaches to the Tank Hull Tub side wall with two M3x12 SHCS and M3 nuts through 3.4 mm holes at x ±12 mm. The rail has a 45° stiffening gusset, counterbored head pockets and 3 mm lead-in chamfers on the keel.

Twin 624 Track Idler Sprocket

The free-running front idler (print 2) for the 'N20 Twin-Track Mini Tank Chassis' kit. It has the same 12-tooth, 12 mm-pitch profile as the drive sprocket: a Ø46 x 10 mm disc with teeth reaching Ø51.2. Its 18 mm hub holds two 624 bearings (4 x 13 x 5 mm) in 13.05 mm press-fit seats, one at each end, with a 10 mm lip between them. The pair spins on the hull's slotted M4x30 bolt axle and stays stiffer and better aligned than a single-bearing idler.

12T Track Drive Sprocket

A 12-tooth, 12 mm-pitch drive sprocket (Ø51.2 mm over the teeth, 10 mm disc) for the 'N20 Twin-Track Mini Tank Chassis' kit. It fits directly onto an N20 gearmotor's 3 mm D-shaft with a 3.2 mm blind bore in a 16 mm hub that is 12.5 mm long. An M3 grub screw and a captured M3 hex nut lock it to the shaft, so no separate hub or plate stack is needed. The teeth have a 45° underside chamfer so they print without supports, and they mesh with the kit's print-in-place track links.

18650 Tank Top Deck

The 130 x 74 x 3 mm lid and battery deck for the 'N20 Twin-Track Mini Tank Chassis' kit. It bolts to the Tank Hull Tub's heat-set corner bosses with four M3x8 SHCS through 3.4 mm holes at ±58/±30 mm. The rear half has two 18.8 x 67 mm open troughs with 12 mm walls for 2x 18650 cells, plus 3 x 22 mm slots for a hook-and-loop strap and lead-wire notches. The front half has a 10 mm grid of 3.4 mm M3 holes for motor-driver and MCU standoffs, and a 20 x 8 mm slot passes the wiring into the hull.

⚠ Flagged: battery or DC power. Not for safety-critical use without independent engineering review.

Twin N20 Motor Clamp Bar

A 30 x 49 x 5 mm clamp bar from the 'N20 Twin-Track Mini Tank Chassis' kit. It lies across the tops of both 12 x 10 mm N20 gearmotors and pulls them down into the Tank Hull Tub cradle with four M3x8 SHCS (3.4 mm holes at ±11/±20 mm) screwed into the hull's heat-set posts. Two 1.5 mm locating lips straddle the 12 mm motor bodies with 0.4 mm clearance, and a 10 mm notch passes the motor wires.

Tank Hull Tub

The 130 x 74 x 36 mm open-top hull for the 'N20 Twin-Track Mini Tank Chassis' kit. It has a supportless cradle for two coaxial N20 gearmotors, 7 x 10 mm stadium slots for the shaft exits, and 4.5 mm slots for tensioning the M4 idler axles. Other features are 3.4 mm M3 holes for the skid rails and eight 8 mm bosses with 4.0 mm bores for M3 heat-set inserts, which hold the motor clamp bar and the 18650 top deck.

Bolt-On Bat Wing Frame

This open bat-wing skeleton is part of the 'SG90 Scotch-Yoke Flapping Wing Rig' kit, and you print two. It measures about 150 x 87 mm and is 3 mm thick. The 30 x 14 x 4 mm root pad bolts to the Shoulder Wing Root Rocker with two M3x8 screws into the rocker's heat-set inserts, through 3.4 mm holes 15 mm apart. From the pad, a 6 mm leading-edge spar, three tapered finger spars and a scalloped trailing rib make a frame of about 9 cm³ that you can cover with fabric or foil.

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.