2GT 16T-40T Timing Belt Pulley Synchronous Aluminium 3D Printer Extruder Gear

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2GT 16T-40T Timing Belt Pulley Synchronous Aluminium 3D Printer Extruder Gear

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By HomeDIYer®

Size: 16T Bore 4mm M4

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$6.38 USD

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In stock (500 units), ready to be shipped

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2GT Timing Belt Pulleys — Precise Aluminium GT2 Drive Gears for 3D Printers & CNC Machines

When a skipped tooth or a loose bore fit ruins a print or throws off a CNC cut, the root cause is almost always a poorly machined pulley. Makers, engineers, and small-batch manufacturers who rely on belt-driven motion systems need pulleys that hold tight tolerances run after run — whether on a desktop 3D printer, a laser engraver, or a custom robotics platform.

These 2GT timing belt pulleys are machined from aluminium alloy with a GT2 tooth profile (2 mm pitch). Available in tooth counts from 16T to 40T and bore diameters from 3.17 mm (1/8 in) to 12 mm (approximately 0.47 in), each pulley ships with set-screw retention to lock firmly onto motor shafts. The lightweight aluminium construction keeps rotational inertia low while providing the rigidity needed for repeatable positioning.

Typical use cases include NEMA 17 stepper motor drives on FDM 3D printers, X/Y axis belt drives on CoreXY and Cartesian machines, extruder gear trains requiring a 2GT belt interface, and light-duty CNC router or laser cutter motion systems where GT2 belt-driven linear positioning is required.

⚙️ Compatible with: GT2 / 2GT timing belts (2 mm pitch) — 6 mm belt width standard. Fits NEMA 17 motor shafts and common CNC/3D printer drive configurations.

✅ Key Features of These 2GT Aluminium Timing Belt Pulleys

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GT2 Tooth Profile (2 mm Pitch)

Engineered to the GT2 / 2GT standard for smooth, low-backlash meshing with standard 2 mm pitch timing belts used across desktop 3D printers and CNC platforms.

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Wide Tooth Count Range: 16T to 40T

Choose from 16, 20, 30, 36, or 40 teeth to match your drive ratio requirements — from fast, high-torque extruder drives to longer-travel axis pulleys.

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Multiple Bore Sizes: 3.17 mm – 12 mm

Bore options cover the most common motor shaft diameters including 3.17 mm (1/8 in), 4 mm, 5 mm, 6 mm, 6.35 mm (1/4 in), 7 mm, 8 mm, 10 mm, and 12 mm for broad compatibility.

⚡

Aluminium Alloy Construction

Machined from aluminium alloy for a low-weight, low-inertia drive component that responds quickly to stepper commands and resists deformation under belt tension.

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Set-Screw Shaft Retention

Each pulley includes set-screw holes for secure shaft locking, preventing slippage during direction reversals and high-acceleration moves common in 3D printing.

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Drop-In Replacement for Standard GT2 Pulleys

Dimensionally compatible with the GT2 pulley standard used on Ender, Prusa, Voron, RatRig, and most open-source 3D printer and CNC designs — no modifications required.

📐 Technical Specifications — 2GT Timing Belt Pulleys

Belt Profile	GT2 / 2GT
Belt Pitch	2 mm
Compatible Belt Width	6 mm (standard)
Tooth Count Options	16T, 20T, 30T, 36T, 40T
Bore Diameter Options	3.17 mm, 4 mm, 5 mm, 6 mm, 6.35 mm, 7 mm, 8 mm, 10 mm, 12 mm
Material	Aluminium Alloy
Shaft Retention	Set screw(s)
Outer Diameter	See variant options
Hub Width / Flange	See variant options
Finish	Natural aluminium (uncoated)
Quantity per Order	1 piece

❓ Frequently Asked Questions

Which belt is compatible with these pulleys?

These pulleys use the GT2 / 2GT tooth profile with a 2 mm pitch. They are designed to work with standard GT2 timing belts, typically 6 mm wide. This is the most common belt standard used in desktop 3D printers, laser engravers, and light CNC machines. Do not use with HTD, T2.5, or other pitch belts as the tooth geometry will not match.

How do I choose the right tooth count (16T vs 20T vs 40T)?

Tooth count determines your drive ratio and belt wrap. Smaller pulleys (16T, 20T) are typically used on motor shafts for higher torque and faster response — common on extruder drives and X/Y axes. Larger pulleys (30T, 36T, 40T) are used as driven pulleys in reduction setups or where a longer belt wrap is needed for grip. Match your tooth count to your existing system's drive ratio requirements.

How do I select the correct bore size for my motor shaft?

Measure your motor shaft diameter with calipers before ordering. NEMA 17 steppers commonly use 5 mm shafts. Smaller motors may use 3.17 mm (1/8 in) or 4 mm shafts. Larger servo or DC motors may use 6 mm, 6.35 mm (1/4 in), 8 mm, or larger. The bore must match your shaft diameter exactly — a loose fit will cause slippage even with the set screw tightened.

Are these pulleys strong enough for continuous 3D printing use?

Yes. Aluminium alloy pulleys are the industry standard for desktop 3D printers and CNC machines in this class. The material provides sufficient rigidity and fatigue resistance for continuous operation under normal belt tension loads. The set-screw retention prevents shaft slippage during rapid direction changes typical of 3D printing motion profiles.

Will these fit my Ender 3, Prusa, or Voron printer?

These pulleys follow the standard GT2 / 2GT dimensional specification used across most open-source 3D printer designs including Ender series, Prusa i3 variants, Voron, RatRig, and similar platforms. For direct motor shaft replacement, select the bore size matching your stepper shaft (typically 5 mm for NEMA 17). Always verify the tooth count matches your original pulley before ordering.

Do these pulleys include flanges to keep the belt on track?

Yes, these timing belt pulleys include flanges (side walls) on both edges of the tooth section to prevent the belt from walking off the pulley during operation. This is the standard configuration for GT2 drive pulleys used in 3D printers and CNC motion systems.

Can I use these pulleys for a belt-driven linear axis (CoreXY, H-Bot)?

Yes. These 2GT pulleys are well-suited for CoreXY, H-Bot, and similar belt-driven linear motion architectures. For motor pulleys on a CoreXY system, 16T or 20T are the most common choices. Ensure your belt width (6 mm standard) matches the pulley's belt groove width, and verify bore size matches your motor shaft diameter.

🛒 Select your tooth count and bore size above, then add to cart.