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A front bumper bezel for the HC-SR04 ultrasonic sensor: the two 16 mm transducer cans press into 16.2 mm bores on 26 mm centres with 8 mm of engagement, so the board is held by the cans alone and no PCB hole pattern is needed (clone boards vary). Side shrouds protect the PCB and header, the 52.4 x 38 mm foot has two M3 clearance holes on 40 mm centres for a chassis deck plus two M5 clearance holes on 12 mm centres for 2020 T-nuts, and a rear arch takes a zip tie for cable strain relief. Overall 52.4 x 38 x 29 mm.
A 68 × 38 × 5 mm carriage plate that bolts straight onto an MGN12H block (20 × 20 mm M3 pattern, heads recessed in 6.2 mm counterbores) and clamps both ends of a 6 mm GT2 belt on 2 mm-pitch tooth ridges, held by a zip tie through the four 4 × 3 mm slots. Four M3 heat-set bosses (4.0 mm bore, 6 mm deep) on a 38 × 25 mm grid give a flat tool deck for a gantry head, sensor or gripper — the piece a linear-rail axis normally needs but the rail kit never includes.
A pedestal that preloads two 608 bearings (8 x 22 x 7 mm) 36.6 mm apart on a common vertical axis, giving a printed robot-arm shoulder/waist joint the moment stiffness people normally pay $100+ for a cross-roller bearing to get. 44 x 44 mm gusseted flange with four M4 clearance holes on a 32 mm square, 44 mm tall, 19 mm centre bore for an 8 mm shaft plus collars, and a slotted pinch collar with an M3 bolt and captured nut that takes the slop out of the upper press fit.
A print-in-place ball-and-socket gimbal for cameras, lidar pucks and sensor boards on a robot or drone frame: a Ø20 mm ball captured in a spherical socket with a 0.4 mm gap gives 360° pan and roughly ±33° tilt, and one M4 thumbscrew driven into a brass heat-set insert (5.5 mm bore) locks the angle without any springs or shims. The 50 x 34 x 5 mm base bolts down with four M3 screws on a 42 x 24 mm pattern, and the 26 x 26 mm top plate carries four M3 clearance holes on a 18 x 18 mm square; overall 50 x 34 x 48 mm.
A four-link cable drag chain with an integrated M3 mounting foot, printed fully assembled — no pins, no clips, no post-assembly. Each 32 mm link carries an 11 mm wide x 13 mm tall cable channel and an arc-slot bend limiter that stops the chain dead straight and allows 35 deg of bend, so the top run won't sag. Overall 170 x 29 x 16 mm; the foot takes two M3 screws on a 19 mm spacing.
A 60-tooth GT2 timing pulley (2 mm pitch, 37.7 mm tooth OD, 41.7 mm flanges) with an 8.3 mm slip-fit bore for 8 mm shaft and a split-clamp hub tightened by a single M3 screw against a captured M3 nut. 22 mm tall with a 7 mm flanged belt land for 6 mm GT2 belt — the big reduction pulley you can't buy off-the-shelf in 8 mm bore.
Gusseted carriage block that bolts a standard T8 brass leadscrew nut (22 mm square M3 flange pattern, 8 mm screw) to a moving platform — for Z-axis lifts, camera sliders and small CNC gantries. 50 x 62 x 46 mm with a 9.0 mm leadscrew pass-through, four M3 flange holes and four M5 platform bolts on a 26 x 30 mm pattern.
A 62 mm square, 19 mm tall adapter that lets a NEMA 17 stepper bolt into a machine face drilled for NEMA 23 — the base carries the 47.14 mm M5 pattern, the raised Ø52 tower carries the 31 mm M3 pattern with a 22.4 mm pilot register for the motor's centring boss. The hollow Ø30 core clears a shaft coupler, a 14 mm side window gives Allen-key access to the coupler set screw, and counterbores in the base bottom fully recess the four M3x20 motor screws so the adapter still seats flat.
A vibration-isolating NEMA 17 motor mount: the motor bolts to a floating 46 mm plate (31 mm square M3 pattern, 22.5 mm pilot-boss bore) that is joined to a 76 x 76 mm outer frame only by four Z-shaped flexure beams, so motor buzz never reaches the chassis or the gyro. The frame bolts down with four M3 screws on a 68 mm cross pattern; print it as shown (flat, no supports) and flip it in use so the motor plate floats 6 mm clear of the chassis, leaving room for the motor screw heads.
A printed beam-flexure shaft coupler that joins a 5 mm stepper shaft (NEMA 17) to an 8 mm T8 leadscrew, with three 60°-indexed relief slots so it absorbs misalignment instead of binding the nut. 20 mm OD x 44 mm long, 5.3 mm and 8.6 mm bores, four M3 self-tapping grub screws (two per hub at 90°).
A 60 mm OD × 18 mm wide spoked drive wheel that slips onto any 5 mm motor shaft (NEMA 17, 37 mm gearmotor) and locks with an M3 set screw threaded into the 6.3 mm hub wall. The 8 mm × 2.5 mm rim groove seats a #64 rubber band as a tire, and 24 scallops in the flanges give traction if you run it bare — replaces the hub-and-tire set nobody stocks for one-off robot builds.
A split-clamp pillow block that carries two LM8UU linear bearings (15 mm OD x 24 mm) in line on an 8 mm smooth rod, with a centre rib that stops the bearings against each other and two M3 clamp screws that pinch the flanks so nothing walks out. The 60 x 44 x 35 mm body bolts down through four M4 clearance holes on a 40 x 34 mm rectangle, putting the rod axis 21 mm above the mounting surface.
An L-bracket that mounts a NEMA 17 stepper to 2020 aluminium extrusion: 54 x 40 mm base with two M5 T-nut holes on 20 mm centres, and a 54 x 50 mm vertical face carrying the 31 mm square M3 bolt pattern plus a 22.6 mm pilot bore for the motor's centring boss. Twin 5 mm gussets carry motor torque in the strong XY direction and sit outboard of the bolt heads so a hex driver still reaches all four screws; a pair of 6 x 3 mm slots above the bore takes a cable tie for the motor lead.
A curved clip that wedges onto the rim of a 1-gallon paint can, giving you a clean edge to wipe your brush on and a slot to park it over the paint instead of on the rim. Spans a 50° arc of the can, about 74 mm wide.
A 60 mm one-piece carabiner whose gate is a built-in flexing spring arm — press it inward to hook on, and a capture nose stops it opening under load. Prints flat with no supports, no assembly, and no metal spring; sized for keys, water bottles, and bag straps.
A screw-on wall gripper whose springy C-jaws snap over a 20–26 mm broom, mop, rake or squeegee handle so it hangs off the floor. 60 mm back plate with two counterbored screw holes; 18 mm tall jaws with a 19 mm snap mouth.