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N20 Worm Motor Sled
This motor sled is part of the 'N20 Self-Locking Worm-Drive Winch' kit. It holds an N20 gearmotor (12 x 10 mm gearbox, 3 mm D-shaft, fixed with two zip-ties) and a 624 tail bearing (4 x 13 x 5 mm, 13.05 mm press pocket) in line with the worm axis. It bolts to the base plate with three M3 heat-set inserts (4.0 mm bores) and M3x10 screws, and measures 22 x 95 x 24.5 mm. The middle insert bore goes through the floor because the floor under the worm is only 6 mm thick.
624 Bearing Front Wheel
A free-rolling Ø60 x 20 mm front wheel for the 'SG90 Ackermann Steering Rover Chassis' kit. It has two tyre grooves (3 x 1.5 mm, 5 mm in from each face) for O-rings or rubber bands. Each face has a Ø13.05 x 5.2 mm press-fit pocket for a 624 bearing (4 x 13 x 5 mm), and a Ø6 bore passes through the web for the knuckle's M4x30 axle bolt. Print two. It prints flat with no supports: a 4 mm floor web and six full-height spokes join the 3 mm rim to the Ø20 hub.
Seven-LED Lamp Head
This is the tilting head of the 'MG90S Animatronic Desk Lamp Robot' kit. It has a 70 mm shade with a 3 mm face that takes seven 5 mm LEDs through 5.3 mm holes, one in the centre and six on a 16 mm radius. The 32 mm-wide R14 tilt tongue sits with its axis 50 mm above the face. The side-A pad takes the MG90S/SG90 horn. Side B has a 4.5 mm M4 hole, an M4 nut pocket (7.2 mm across flats) and a 7 mm boss that runs on the Upper Arm's 624 bearing (4 x 13 x 5 mm). The pivot is an M4x16 bolt.
Upper Arm Channel Link
This is the elbow-to-head link of the 'MG90S Animatronic Desk Lamp Robot' kit. It is a 131 x 47 x 28 mm U-channel, printed web-down, with its joint axes 95 mm apart. The elbow tongue is 32 mm wide and takes the MG90S/SG90 horn on one side. On the other side it takes an M4x16 bolt, a captive M4 nut and a 7 mm boss that runs on a 624 bearing (4 x 13 x 5 mm). The head clevis is 36 mm wide. It has two M3 heat-set bores (4.0 mm) at a 44 mm pitch for the slotted servo plate, and a 13.05 mm press-fit seat for a 624 bearing.
Lower Arm Channel Link
Shoulder-to-elbow link for the 'MG90S Animatronic Desk Lamp Robot' kit. It is a 146 x 47 x 28 mm U-channel printed web-down. The 32 mm tongue takes the shoulder servo horn on one side and an M4x16 bolt, M4 nut and 624 bearing on the other. At the top end, a 36 mm elbow clevis has two M3 heat-set bores for the slotted MG90S/SG90 plate and a 13.05 mm press-fit seat for a 624 bearing (4 x 13 x 5 mm).
Turntable Shoulder Clevis
Yaw turntable for the 'MG90S Animatronic Desk Lamp Robot' kit. It is a 118 mm disc that rides on the Weighted Yaw Base Tub's thrust rim at r=54–60, centred by a 53.5 mm skirt. A 32 mm solid horn pad with a 7 mm screw-access hole takes the MG90S/SG90 yaw servo horn. The shoulder clevis sits 36 mm above the deck, with 36 mm between the cheeks. The servo cheek has M3 heat-set bores at a 44 mm pitch and a 34 × 16 mm body window for the slotted servo plate. The bearing cheek has a press-fit 624 seat, 13.05 × 5 mm, behind a 10 mm lip. The disc also has two 20 × 8 mm wire slots.
Horn-And-Bearing Joint Yoke
A C-shaped yoke for a robot arm joint. The top arm bolts to a servo horn (7 mm centre hole plus two 2.4 mm screw slots) and the bottom arm holds a 624 bearing (13 mm OD) press-fit on the same axis, so the servo is supported on both sides instead of hanging off its spline. The 5 mm back plate has four M3 clearance holes on a 16 x 20 mm pattern to mount the next arm link, and the part prints on its side so the joint loads run along the layers, not across them.
624 Bearing Tread Wheel
A 32 mm OD x 9 mm wide passive side wheel from the 'SG90 Wheeled Serpentine Snake Robot' kit. It has a 13.05 mm press pocket, 5 mm deep, for a 624 bearing (4 x 13 x 5 mm), and a 4 mm outer web with a 10 mm through-hole so an M4x16 SHCS and washer can bear on the inner race. A 3 x 1.5 mm centred tread groove takes a rubber band or O-ring tyre for sideways grip.
Wheel Axle Bridge
A 16 x 36 x 11.5 mm black box-section axle bridge from the 'SG90 Wheeled Serpentine Snake Robot' kit. It bolts under each Servo Segment Housing floor with two M3x12 SHCS through 3.4 mm holes into the floor's M3 heat-set inserts. Each flat outer cheek at y = ±18 carries an 11 mm M4 heat-set boss with a 5.5 mm teardrop bore. That bore takes an M4x16 SHCS as the axle for a 624-bearing tread wheel. A bottom tie and a centre web stiffen the cheeks against wheel side-load, and relief pockets let a hex key reach the M3 screw heads.
Servo Segment Housing
Open-top body segment for the 'SG90 Wheeled Serpentine Snake Robot' kit. It measures 50 x 36 x 33 mm and holds an SG90 or MG90S servo on a z=33 tab seat. Four M3 heat-set pillars take the clamp frame, and a 16 x 20 mm M3 heat-set face bolts to the next yoke. It also has an M4 pivot slot for the 624-bearing joint bolt and two M3 heat-set floor bosses for the wheel axle bridge.
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.
X Arm Tip Idler Roller
The far-end block for the 'NEMA17 Cantilever Pen Plotter' kit's X arm, about 54 x 57 x 74 mm. It clamps the ends of two 8 mm rods set 40 mm apart in 25 mm pinch sockets (M3x16 screw plus a captured M3 nut in each). Two cheeks hold a 608 bearing as the GT2 belt idler on an 8x25 mm dowel, locked by an M3x10 self-tap screw. Below, a fork carries a 624 bearing on an M4x20 axle in a height-adjustable slot, so the arm tip rolls on the desk and can be levelled. It prints upside down, standing on the flat tops of the cheeks and clamps.
5 mm Shaft Groove Cam For 624 Roller
A positive-drive face cam for a 5 mm motor shaft such as a NEMA 17. Its closed 13.6 mm groove holds a 624 bearing (13 mm OD) as the roller and drives it both ways, so the follower needs no return spring. Each turn gives a 15 mm cycloidal rise over 120°, a 60° dwell, a 120° return and a 60° dwell. The cam is about 92 × 107 mm, and an M3 set screw with a captured nut locks the hub to the shaft.