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When a loose or mismatched pulley causes layer shifts on your 3D printer or positioning errors on your CNC router, the root cause is almost always an imprecise bore fit. Hobbyists, makers, and small-shop machinists who demand repeatable motion control need a pulley that locks onto the shaft without play — and that's exactly what these stepped-bore GT2 pulleys deliver.
Each pulley is machined from aluminum alloy with a 30-tooth GT2 tooth profile. The stepped bore design accommodates shaft diameters ranging from 5 mm to 10 mm (approximately 0.20" to 0.39"), and belt widths of 6 mm or 10 mm (approximately 0.24" or 0.39") are available depending on your drive system. A set screw secures the pulley firmly to the shaft for zero-slip torque transmission.
Typical use cases include Cartesian and CoreXY 3D printer X/Y axis drives, CNC router gantry belt drives, laser engraver motion systems, and DIY pick-and-place machines — anywhere a GT2 2 mm pitch belt is used for precise linear positioning.
Accommodates multiple shaft diameters (5 mm, 6 mm, 6.35 mm, 8 mm, 10 mm) in a single pulley body, reducing the number of SKUs you need to stock for mixed-shaft machines.
The 30T tooth count and 2 mm pitch GT2 profile deliver smooth, low-backlash power transmission compatible with standard GT2 open and closed-loop belts.
Lightweight yet rigid aluminum alloy body resists deformation under belt tension, maintaining tooth engagement accuracy over extended print or cutting sessions.
Includes a set screw for positive shaft retention, preventing rotational slip during rapid direction changes common in 3D printer acceleration profiles.
Available in 6 mm and 10 mm belt width configurations, covering the two most common GT2 belt widths used in desktop CNC and FDM 3D printer builds.
Dimensionally consistent with standard GT2 30T pulleys used in popular open-source printer designs (Ender, Voron, RatRig, and similar platforms), making replacement straightforward.
| Tooth Count | 30T |
|---|---|
| Belt Pitch | GT2 (2 mm) |
| Belt Width | See variant options (6 mm or 10 mm) |
| Bore Diameter | See variant options (5 mm / 6 mm / 6.35 mm / 8 mm / 10 mm) |
| Material | Aluminum Alloy |
| Shaft Retention | Set Screw |
| Outer Diameter | Approx. 20 mm (0.79") |
| Flange | Flanged (both sides) |
| Finish | Natural anodized / silver |
| Compatible Belt | GT2 open belt / GT2 closed loop belt |
| Quantity | See variant options |
Measure your motor shaft diameter with a caliper. Common stepper motor shaft sizes are 5 mm (NEMA 17 standard), 6.35 mm (1/4"), and 8 mm (larger NEMA 23 motors). Select the bore option that matches your shaft exactly — the stepped bore allows the pulley to fit snugly without an adapter sleeve.
The belt width must match your existing GT2 belt. Most compact desktop 3D printers (Ender 3, Voron 0, etc.) use 6 mm wide GT2 belts, while larger-format machines and some CoreXY builds use 10 mm wide belts for higher load capacity. Check your belt width before ordering.
Yes. The 30T GT2 tooth profile is compatible with both open-ended GT2 belts and GT2 closed-loop (loop) belts of the matching width. Ensure the loop belt's inner circumference is appropriate for your axis travel distance.
The set screw provides firm mechanical retention suitable for typical 3D printer and light CNC router acceleration profiles (up to approximately 3,000–5,000 mm/s²). For very high-acceleration applications, applying a small amount of thread-locking compound to the set screw is recommended for added security.
The aluminum alloy body with anodized finish offers good resistance to oxidation in normal indoor workshop environments. Avoid prolonged exposure to moisture or corrosive chemicals. The set screw is typically steel — if used in humid conditions, applying a light coat of machine oil to the screw is advisable.
Yes. The GT2 30T profile and 5 mm bore variant are dimensionally compatible with the stock X/Y axis pulleys on Creality Ender 3, Ender 3 Pro, Ender 3 V2, and many other NEMA 17-driven printers. Select the 5 mm bore and 6 mm belt width variant for a direct drop-in fit.
You need to match three parameters: (1) Belt Model — GT2 for all standard GT2 systems; (2) Number of pulley teeth — 30T is the most common for desktop machines; (3) Bore & Belt Width — select the bore that matches your motor shaft and the belt width that matches your existing belt. If unsure, contact us to confirm before ordering.
