Heads up: many models on this page are AI-generated or uploaded untested. They may be misconfigured for the intended application — check the dimensions and tolerances, and verify or edit the model before printing or relying on it.*
Idler Pin Pivot Post
A gusseted upright post that bolts to a robot chassis plate with two M3 screws on 26 mm centres and holds a 4 mm steel pin in a press-fit cross bore 22 mm up. You can use it as the pivot for a belt idler arm, a tensioner lever or a small swing arm. The flange is 36 x 8.5 x 4 mm, the upright is 16 mm wide and 28 mm tall, and two 45° gussets carry the load in the print plane.
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.
Y Idler End Block
Belt idler end block that clamps onto two parallel 8 mm smooth rods 60 mm apart, using pinch slits with M3 screws and captured nuts. It carries a 608 bearing (8 x 22 x 7 mm) as a GT2 belt idler on an 8 mm pin, with a 7.4 mm running gap and an M3 self-tap lock screw that stops the pin walking out. It's for gantries, camera sliders and linear axes built on rods.
Shoulder Idler Cheek 625
An upright cheek plate for a robot-arm turntable. It holds the idle end of an M5 shoulder axle 33 mm above the base, with a captured M5 nut on the inner face so the axle can be tightened from one side. The 30 x 40 mm gusseted foot has two 10 mm M3 slots so you can slide the cheek to take up axial play against a 625 bearing stack.
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.
Tracked Robot Screw-Tension Idler Arm
A bell-crank idler arm for printed tank-track robots. It pivots on an 8 mm rod and holds an 8 mm axle 60 mm away for a 608-bearing idler wheel, with a 12 mm shoulder so only the inner race rubs. An M4 bolt runs through a captured-nut lug and sets the track tension without redesigning the chassis. The arm is 80 x 54 x 14 mm with 8.3 mm slip-fit bores.
608 Flat Belt Idler Pulley
A 68 mm OD flanged flat idler pulley that runs on two press-fit 608 bearings (22.05 mm pockets, 7 mm deep, top and bottom) instead of a molded plastic sleeve, with a 16 mm flat belt face sized for 1/2 in V-belt backsides and 4 mm flanges to keep the belt tracking. Replaces seized or shattered deck/tensioner idlers on mowers, snowblowers and belt-driven robot drivetrains; ribbed rim and hub keep it under ~40 cm³ and print it without supports.