Runice 2GT Timing Pulley

Choose your belt width from the dropdown.

Silver-finished Runice drive pulleys for precise belt-driven motion systems such as Voron-style 3D printers. Both variants share the same 20-tooth 2GT/GT2 tooth profile and 5 mm H7 bore for standard NEMA 17 stepper shafts — the only difference is the belt width the flanges are cut for, and the resulting overall height.

Which variant do I need?

• 6 mm — the standard choice for most Voron 2.4, Trident and Switchwire-class XY drives, and for any BOM that calls for a 20T B5W6 pulley.
• 9/10 mm — for builds that specify 9/10 mm-class belts. The wider belt is stiffer than 6 mm, which is why larger or faster gantries call for it.

Check your BOM before ordering. A 9/10 mm pulley will not track a 6 mm belt properly, and a 6 mm pulley physically will not take a 9 mm belt.

Why this pulley

• 2GT / GT2, 20-tooth profile for common 3D-printer XY and motion drives.
• 5.000 mm H7 bore fits the standard shaft size on many NEMA 17 stepper motors.
• Works with 2 mm-pitch Gates-style GT2 belts, and with GT3 belts run on 2GT pulleys.
• Two M4 set screws clamp the pulley to the shaft; the flanged body helps keep the belt tracked.
• Silver anodised finish for builds that use natural-aluminium motion hardware.
• Drawing-backed dimensions — each variant carries its own Runice drawing number.

Variants

Shared specifications

• Manufacturer: Runice
• Tooth profile: 2GT / GT2, 2 mm pitch
• Tooth count: 20T
• Bore: 5.000 mm H7
• Tooth OD: 12.22 mm
• Flange OD: 15.00 mm
• Set screws: 2 × M4 × 0.7
• Type: drive pulley (not an idler)
• Finish: silver

Fitment and pairing

The 6 mm variant is listed in the Voron 2.4 Motion Kit BOM as the 20T B5W6 Runice RLA20-2GT-6-C-P5-H16 pulley. The 9/10 mm variant suits Monolith-style and other Voron/DIY motion builds that specify a 20T, 5 mm-bore pulley for 9 mm belt.

Belts: Gates LL-2GT 6mm and 9 mm timing belt

Idlers, where the belt path needs a free-spinning part instead of a driven one: Runice 20T idler, 5 mm bore, 6mm or 9mm width

What it is not

• Not a bearing idler — this drives from a motor shaft.
• Not a 10 mm belt-width pulley.
• Not a complete motion kit; this is one pulley.

Check pulley height and belt path against your specific motion system before ordering replacements for non-Voron machines.