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Precision 20T GT2 Timing Pulley with 5mm bore, 2mm pitch, and 9mm belt support for Rat Rig V-Core 3, DIY 3D printers, CNC machines, robotics, and custom GT2 motion systems.
$4.95
The 20T GT2 Timing Pulley is a compact synchronous belt pulley designed for mechanical transmission in 3D printers, CNC machines, robotics, laser engravers, automation projects, and custom motion systems. This pulley is made for 9mm GT2 timing belts and features a 5mm bore, 2mm tooth pitch, and 20 tooth profile.
This product is especially useful for Rat Rig V-Core 3 style builds and other DIY CoreXY 3D printers that use wider 9mm GT2 belts for motion. Your current dnb3D product page identifies this as a Rat Rig V-Core 3 specific part for the XY drive assembly and notes that 2 pieces are required for that build use. It can also be used in compatible DIY 3D printer, CNC, robotics, and custom machine assemblies where a 20T GT2 pulley with 5mm bore and 9mm belt support is required.
GT2 timing belts are commonly used in 3D printers and compact machine motion systems because they provide synchronized belt movement in a small mechanical package. This pulley supports a maximum belt width of 9mm, making it suitable for motion systems that use wider GT2 belts than the common 6mm format. Always confirm belt width, bore size, tooth pitch, and pulley clearance before installation.
Unlike a smooth idler pulley, this is a toothed timing pulley designed for mechanical transmission. The 20 tooth GT2 profile engages the belt teeth to transfer motion from a shaft or motor to the belt. This makes it suitable for drive assemblies, XY motion systems, belt reduction layouts, gantries, and other synchronized motion applications.
The 5mm bore allows this pulley to fit compatible 5mm shafts, motor shafts, axles, or custom motion hardware depending on the build. Before installation, confirm shaft fitment and check that any set screws, collars, spacers, brackets, or nearby printed parts have proper clearance. Poor shaft fit or pulley alignment can cause wobble, belt tracking issues, skipped motion, and premature belt wear.
This pulley is listed for Rat Rig V-Core 3 use in the XY drive assembly. For that application, 2 pieces are required. If you are repairing, upgrading, or sourcing parts for a Rat Rig-style build, confirm your exact printer version and build documentation before ordering. V-Core designs and upgrade paths can vary depending on revision and printed part set.
The pulley is made from aluminum alloy, giving it a good balance of strength, low weight, and clean machine appearance. Aluminum pulleys are widely used in 3D printer and light machine builds because they reduce rotating mass while providing reliable belt engagement in properly aligned motion systems.
For related components, browse the 3D Printer Parts category or the Fasteners category. This pulley can be paired with GT2 timing belts, metric socket head screws, spacers, bearings, linear rails, guide blocks, smooth rods, and other motion hardware from dnb3D.
Timing belt pulley systems are used where synchronized belt motion, repeatability, and compact mechanical drive layouts are required. For general engineering context on synchronous timing belt systems, see this synchronous belt drive reference.
Every order is hand-inspected and precision-shipped from dnb3D in Marathon, Ontario. Whether you are maintaining a Rat Rig V-Core 3, building a DIY CoreXY printer, assembling a CNC axis, or designing a custom belt-driven machine, this 20T GT2 Timing Pulley provides a reliable 9mm GT2 belt motion component for precision builds.
The 20T GT2 Timing Pulley is designed for 9mm GT2 synchronous timing belt systems used in Rat Rig V-Core 3 style builds, DIY 3D printers, CNC projects, robotics, and custom machine assemblies.
| Product Type | GT2 synchronous timing pulley / drive pulley |
|---|---|
| Tooth Profile | GT2 |
| Tooth Pitch | 2mm |
| Number of Teeth | 20 |
| Compatible Belt Type | GT2 synchronous timing belt |
| Maximum Belt Width | 9mm |
| Inner Bore | 5mm |
| Inner Diameter | 5mm |
| Tooth Outer Diameter | 12mm |
| Flange Outer Diameter | 16mm |
| Overall Height | 19mm |
| Material | Aluminum alloy |
| Common Printer Fitment | Rat Rig V-Core 3 XY drive assembly; 2 pieces required for that application |
| SKU | DB-0056-5966 |
| Common Applications | Rat Rig V-Core 3, DIY CoreXY printers, 3D printers, CNC machines, robotics, laser engravers, plotters, automation projects, and belt-driven motion systems |
| Installation Style | Mounted on compatible 5mm shaft, motor shaft, or axle hardware as part of a GT2 belt drive system |
| Assembly Warning | Confirm belt width, 5mm bore fit, tooth pitch, shaft fit, pulley alignment, flange clearance, and mounting hardware before installation. Misalignment can cause belt wear, noise, slipping, or poor motion quality. |
| Fulfillment | Hand-inspected and precision-shipped from dnb3D in Marathon, Ontario, Canada |
Before installing the 20T GT2 Timing Pulley, confirm that your belt is a compatible GT2 synchronous timing belt and that your design requires a pulley for up to 9mm belt width. Using the wrong belt width or tooth profile can cause poor engagement, belt wear, skipped motion, or unreliable movement.
This pulley has a 5mm bore. Confirm that your motor shaft, axle, bolt, or shaft hardware matches the bore and allows proper installation. A loose fit can cause wobble or slipping, while an oversized or damaged shaft can damage the pulley during installation.
This is a toothed GT2 timing pulley, not a smooth idler. It is intended to engage the toothed side of a GT2 timing belt for mechanical transmission. If your application needs to guide the smooth back side of the belt, use a smooth idler pulley instead.
This part is listed for the Rat Rig V-Core 3 XY drive assembly, with 2 pieces required for that use. Confirm your exact printer version, build guide, and printed part set before ordering or replacing motion hardware.
Proper pulley alignment is important for smooth and accurate motion. The pulley should sit square to the belt path so the belt teeth engage evenly. Misalignment can cause belt edge wear, noise, skipped motion, uneven tension, or rubbing against nearby parts.
If your pulley uses set screws, tighten them against the proper shaft surface or flat where applicable. Use moderate torque and avoid stripping the set screw or damaging the shaft. For high-vibration printer and CNC applications, removable threadlocker may be used if compatible with your build.
Use reasonable belt tension for your machine design. A belt that is too loose can skip or produce inaccurate motion, while a belt that is too tight can increase bearing load, create noise, wear the belt, or strain motor shafts and brackets.
Keep the pulley teeth and belt path free from dust, chips, filament debris, grease buildup, and abrasive particles. Contamination can reduce belt life and create rough or noisy motion. Inspect the pulley during regular printer or machine maintenance.
Every order is hand-inspected before shipping. dnb3D precision-ships pulleys, fasteners, motion parts, and small machine hardware across Canada from our Ontario facility, helping Rat Rig builders, DIY printer owners, makers, and machine owners receive clean, usable parts ready for careful installation.
At dnb3D, we don’t just ship boxes—we manufacture solutions. Operating our Industry 4.0 micro-factory in Marathon, Ontario, means your order is handled by the same people who design and test these components.
Ready to Ship (3D Printer Parts & Hardware): Finished, inspected, and on the shelf. Dispatched within 1 to 2 business days.
In-House Manufacturing (Laser, Plasma, 3D Prints): These items are manufactured “fresh” to order. Please allow 3 to 5 business days for precision cutting and finishing.
Custom Projects: Bespoke designs require a consultation and a locked-in timeline before production begins.
We ship nationwide across Canada and the USA. Centrally located on the North Shore of Lake Superior, we are uniquely positioned to get your products moving quickly to either coast.
We stand behind every weld, cut, and print. If a product doesn’t meet your expectations, contact the Hub within 30 days. If we wouldn’t put it in our own shop, we won’t let it sit in yours.
Standard Items: Contact us within 30 days for return authorization. Items must be in original, unused condition.
Custom/Personalized Orders: Digitally fabricated to your exact specs (names, custom dimensions, or unique finishes) are final sale once production begins.
Shipping Costs: Return shipping is the responsibility of the customer unless the item arrived damaged or defective.
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