Print-ready 3D models

2020 Gripper Wrist Bracket

This L-bracket mounts the 'NEMA17 Rack-and-Pinion Parallel Gripper' kit to a 2020 extrusion arm. Its 70 × 23 × 8 mm flange bolts to the back of the frame plate with four M3x10 screws into M3 brass heat-set inserts (4.0 mm bores, 7 mm deep) at (±25, 38) and (±25, 50). Its 70 mm long, 24 × 6 mm arm clears the NEMA 17 body. The arm takes two M5 screws and T-nuts through 5.5 mm teardrop holes 20 mm apart, and a 5.6 × 1.5 mm key rib locates it in the 6 mm slot. The part prints standing on its plate-contact face, so it needs no supports.

V-Groove Gripper Finger

A bolt-on L-shaped jaw finger (print ×2) for the 'NEMA17 Rack-and-Pinion Parallel Gripper' kit. Its 28 × 36 × 5 mm flange fixes to the LM8UU jaw carriage with two M3x12 screws into brass heat-set inserts, through 3.4 mm counterbored holes 24 mm apart. The 6 mm blade reaches 65 mm forward and has a 90°, 3 mm deep V-groove that centres round stock, plus three grip ribs. The fingers close to a 4 mm gap and open to 56 mm.

24T Module 1.5 Drive Pinion

The 24-tooth, module 1.5, 20° involute drive pinion for the 'NEMA17 Rack-and-Pinion Parallel Gripper' kit. It has a 36 mm pitch diameter, 39 mm tip diameter and 10 mm face width, and it drives both gripper racks. A 14 mm hub, 7.5 mm long, fits into the frame plate's 22.4 mm hole. The gear goes on a NEMA 17's 5 mm shaft (5.2 mm bore) and is held by an M3 set screw that threads into a captured M3 hex nut.

Gripper Drive Gear Rack

Straight drive rack for the 'NEMA17 Rack-and-Pinion Parallel Gripper' kit (print ×2; the second one is rotated 180° about Z). It is 64 × 16.4 × 12 mm, with 9 teeth at module 1.5 and 20° pressure angle (4.712 mm pitch, 10 mm face width) that mesh with the 24T pinion on the NEMA 17 shaft. It bolts under the LM8UU jaw carriage with two M3x20 screws into M3 brass heat-set inserts (4.0 mm bores, 7 mm deep, 12 mm apart).

LM8UU Jaw Carriage

The sliding jaw body for the 'NEMA17 Rack-and-Pinion Parallel Gripper' kit (print ×2). It is 28 × 102 × 21 mm and holds two LM8UU bearings (15 mm OD × 24 mm) in 15.05 mm press-fit bores 80 mm apart on 8 mm rods. It takes the drive rack on two M3x20 counterbored screws and the finger on two M3 heat-set inserts. Print it standing on its outer face so the bearing bores are vertical. Blind pockets cut the weight to about 41 cm³, and the inner face stays flat so it lines up with the finger's grip face.

Gripper Rod End Block

Split-clamp end block, printed ×2, for the 'NEMA17 Rack-and-Pinion Parallel Gripper' kit. It is 12 × 100 × 36 mm and holds both 8 mm rods (y ±40) in 8.3 mm bores. Each rod is locked by an M3x20 pinch screw and a captured M3 nut across a 1.5 mm slit. The block bolts to the frame plate through two M3 heat-set inserts, and its flat inner face is the open-jaw hard stop.

Gripper Motor Frame Plate

The 150 x 110 x 6 mm base plate for the 'NEMA17 Rack-and-Pinion Parallel Gripper' kit. A NEMA 17 stepper bolts to the back using four M3 holes on the 31 mm square, and its 22 mm pilot boss passes through a 22.4 mm hole. Two rod end blocks attach at x ±64 with M3 screws, and the 2020 wrist bracket attaches through four M3 holes at (±25, 38/50). Through-pockets bring the weight down to about 58 cm³, with an 8 mm stiffening rim left around the edge.

GT2 Toothed Belt Clamp Plate

This belt clamp plate is part of the 'NEMA17 Belt-Drive Camera Slider' kit. The 70 × 24 × 4 mm red plate clamps both ends of the 6 mm GT2 belt against the Quad LM8UU Camera Carriage's belt tab. A 7 mm band of 2.0 mm-pitch ridges (1.0 mm wide, 0.75 mm tall) meshes with the belt teeth so the belt can't slip. Four M3x12 screws pass through 3.4 mm holes on a 35 × 15 mm rectangle into the tab's M3 heat-set inserts. The holes sit above and below the belt band, so no screw goes through the belt.

Quad LM8UU Camera Carriage

This is the sliding camera sled for the 'NEMA17 Belt-Drive Camera Slider' kit. The 90 × 84 × 30 mm carriage rides on two 8 mm rods set 60 mm apart. Four LM8UU bearings (15 × 24 mm) press into two teardropped 15.05 mm through-bores. A hanging belt tab has four M3 heat-set inserts that take the GT2 clamp plate. The deck has a 6.8 × 30 mm slot for a 1/4"-20 camera screw and four M3 heat-set bores on a 40 mm square. It prints deck-down with no supports.

Twin-625 Flanged Idler Drum

This is the belt-return idler for the 'NEMA17 Belt-Drive Camera Slider' kit. It is a 34 mm dia × 12.5 mm flanged drum with a 26 mm dia × 7 mm smooth face for a 6 mm GT2 belt. Two 625 bearings (5×16×5 mm) press into its 16.05 mm through-bore, one from each end. It turns on the M5x35 axle in the Slider Idler Fork End Block, with one M5 washer on top. The top flange is a 45° chamfer, so it prints standing up with no supports.

Slider Idler Fork End Block

The far end block of the 'NEMA17 Belt-Drive Camera Slider' kit. The 45 x 84 x 40 mm block holds two 8 mm smooth rods 60 mm apart in 25 mm deep blind sockets. Each rod is locked by an M3 heat-set insert and an M3x8 pinch screw. A 36 x 13.5 mm fork slot houses the 34 mm flanged twin-625 idler drum on a vertical M5x35 axle, with the nut held in a pocket underneath. It prints lying on its outboard face with no supports, and it weighs about 80 cm³ after lightening pockets.

Slider Motor End Block

This is the motor end of the 'NEMA17 Belt-Drive Camera Slider' kit. The 84 x 48 x 40 mm block holds two 8 mm smooth rods 60 mm apart in 25 mm deep blind sockets, each locked by an M3 heat-set insert and an M3x8 pinch screw. A NEMA17 stepper mounts upside down on the 5 mm top plate with four M3x10 screws (31 mm square) and a 22.4 mm pilot hole. Below the plate, a 40 mm wide cavity encloses the GT2 20T pulley and the belt.

18650 Battery Top Deck

Part of the 'NEMA17 Self-Balancing Robot Frame' kit (print ×1): the 120 × 80 × 4 mm top deck, which bolts to the stack columns with four M3x10 screws through 3.4 mm holes at (±44, ±34). A tray with 2 mm walls rises 14 mm above the deck and holds a 3S 18650 pack in a 70 × 58 mm space. Four 20 × 3 mm slots take two 20 mm hook-and-loop straps. A 12 × 8 mm notch in the end wall and a 20 × 8 mm floor slot route the battery leads down to the electronics deck.

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

Tip-Over Skid Leg

Part of the 'NEMA17 Self-Balancing Robot Frame' kit (print ×2): a 10 mm thick triangulated skid leg that bolts under each end of the 120 × 80 mm base deck. It stops a fall at about 27°, on a 5 mm radius foot that sits 64 mm below the deck. The 35 × 8 mm flange takes two M3x12 screws through 3.4 mm holes at y = 10 and 20 mm. M3 nuts drop into captive 5.7 mm side slots, so they're held in the flange. It stays within x = ±5 mm, clear of the NEMA17 motor bodies.

M3 Insert Stack Column

Part of the 'NEMA17 Self-Balancing Robot Frame' kit (print ×8): a round spacer column, 12 mm OD × 60 mm long, that sets the 64 mm deck-to-deck spacing. Each end has a 4.0 mm × 8 mm deep bore for an M3 brass heat-set insert, with a 0.4 mm lead-in chamfer. The deck bolts on with an M3x10 screw through its 3.4 mm hole at (±54, ±34) or (±44, ±34). Six 0.8 mm flutes add grip and still leave 3.2 mm of wall around each insert.

90 mm Set-Screw Balance Wheel

Part of the 'NEMA17 Self-Balancing Robot Frame' kit (print ×2): a one-piece wheel, 90 mm OD × 20 mm wide, that fits a NEMA17's 5 mm shaft. It has a 5.3 mm through-bore and a 24 mm hub, and an M3 set screw threads into a captive M3 nut that drops into a slot open at the hub's top face. The rim has a 14 × 1.5 mm tread channel with 3 mm lips on each side to hold rubber bands or an inner-tube strip. The 4 mm web has six lightening windows and 8 mm spokes.

NEMA17 Wheel Motor Hanger

Part of the 'NEMA17 Self-Balancing Robot Frame' kit (print ×2). This gusseted L-bracket hangs a NEMA17 stepper under the 120 x 80 mm base deck with the shaft pointing out toward the wheel. It has a 5 mm face plate with a 22.5 mm pilot hole and 3.4 mm holes on the 31 mm square for M3x8 screws. The 35 x 56 mm top flange has four 3.4 mm holes on the deck's 10 mm grid (x = 30/50, y = ±10) for M3x12 screws, washers and nuts. Round holes, not the slots many bought L-brackets use, so the motor can't shift under balancing loads.

Balancer Grid Deck Plate

Part of the 'NEMA17 Self-Balancing Robot Frame' kit (print ×2): a 120 x 80 x 4 mm deck with 6 mm corner radii and a 55-hole M3 grid (3.4 mm holes on a 10 mm pitch). NEMA17 motor hangers and tip-over skids bolt to the grid with M3x12 screws and nuts. Two column patterns, at (±54, ±34) and (±44, ±34), take M3x10 screws into the 12 mm heat-set stack columns, and four 10 x 6 mm edge notches pass wiring between decks.