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When a worn or mismatched timing pulley causes layer shifts, belt slippage, or inconsistent motion in your 3D printer or CNC build, the entire project suffers. These GT2 6mm idler and drive pulleys are designed for makers, engineers, and repair technicians who need dimensionally accurate, drop-in replacements or upgrade components without guesswork.
Each pulley is machined to GT2 profile specifications with a 6mm belt width. Tooth counts range from 16 to 40 teeth, and bore diameters span 3.17mm to 12mm (approximately 0.125 in to 0.472 in), covering the most common shaft sizes used in desktop motion systems. The set screw interface accepts M3 or M4 fasteners depending on the variant selected.
Typical applications include CoreXY and Cartesian 3D printer belt drive systems, DIY CNC router axis drives, laser engraver gantry assemblies, and custom linear motion rigs requiring GT2-compatible idler or drive pulleys with precise bore-to-shaft fit.
Available in 16, 20, 30, 36, and 40 tooth configurations to match your gear ratio and belt path requirements across a variety of motion system designs.
Bore options from 3.17mm to 12mm (including 1/4" / 6.35mm) accommodate the most common stepper motor shaft diameters used in 3D printers and CNC machines.
Machined to GT2 belt profile standards with 6mm belt width, ensuring consistent tooth engagement, reduced backlash, and reliable belt tracking under load.
Each pulley includes a set screw interface (M3 or M4 depending on variant) for secure shaft clamping. Matching M3 and M4 hex wrenches are available as add-on variants.
Order as a single piece for a targeted repair, or choose 5-pack or 10-pack quantities for workshop stock, multi-axis builds, or spare parts inventory.
Suitable for use as both drive pulleys (motor shaft mounted) and idler pulleys (tensioner or redirect applications), giving you flexibility across different belt routing layouts.
| Belt Profile | GT2 (2mm pitch) |
|---|---|
| Belt Width | 6mm |
| Tooth Count Options | 16 / 20 / 30 / 36 / 40 teeth |
| Bore Diameter Options | 3.17mm / 4mm / 5mm / 6mm / 6.35mm / 7mm / 8mm / 10mm / 12mm |
| Set Screw Thread | M3 or M4 (see variant options) |
| Material | See variant options |
| Finish | See variant options |
| Packing Quantity | 1 pcs / 5 pcs / 10 pcs |
| Compatible Belt | GT2 6mm open or closed loop timing belt |
| Weight (per piece) | See variant options |
The tooth count determines your drive ratio and belt speed. Most stock 3D printers (Ender, Prusa, Voron, etc.) use 20-tooth pulleys on the motor shaft. Larger tooth counts like 30 or 40 are used for idler or tensioner positions, or in custom gearing setups. Check your printer's BOM or belt routing diagram to confirm the correct count before ordering.
Most NEMA 17 stepper motors have a 5mm shaft diameter — select the 5mm bore variant for a direct fit. NEMA 23 motors typically use 6.35mm (1/4") or 8mm shafts. If you are unsure, measure your motor shaft with a caliper before ordering. A bore that is too large will cause runout even with the set screw tightened.
Yes. These pulleys are machined to the GT2 2mm pitch profile and work with both open-ended GT2 belt stock and pre-formed closed-loop GT2 belts, as long as the belt width is 6mm. They are not compatible with GT3, HTD, or MXL profile belts.
Yes. These pulleys can be mounted on a fixed shaft or bolt as idler/tensioner wheels. For idler use, you will typically pair them with a flanged bearing pressed into the bore, or mount them on a shoulder bolt of the matching diameter. The bore size you select should match your idler bolt or bearing outer diameter.
The set screw provides a secure mechanical lock when properly torqued against the shaft. For best results, ensure the shaft has a flat spot (D-cut) aligned with the set screw, and use the included hex wrench to tighten firmly. For high-torque or high-speed applications, applying a small amount of thread-locking compound to the set screw is recommended.
The M3 and M4 hex wrenches are sold as separate add-on variants for use with the corresponding set screw sizes on the pulleys. Smaller bore pulleys (e.g., 3.17mm, 4mm) typically use M3 set screws, while larger bore pulleys (e.g., 6mm and above) often use M4. Check the variant description or contact us to confirm which set screw size applies to your selected pulley.
Yes — the per-unit price decreases with larger pack quantities. The 5-pack and 10-pack options are well-suited for multi-axis printer builds (where you need identical pulleys on X and Y), workshop spare parts stock, or group buys. If you are building a CoreXY or H-bot printer, you will typically need at least 4–6 pulleys of the same spec.
