GT2 Timing Belt Closed Loop 6mm Wide – 2mm Pitch Rubber Drive Belt for 3D Printer & CNC

Measure the center-to-center distance between your two pulleys, then calculate the required belt loop length. For GT2 belts, the circumference equals the total loop length. Common 3D printer models typically use belts in the 136–160mm range, while larger CNC setups may require 162–174mm. Check your machine's documentation or measure the existing belt for the exact size.

This belt uses the GT2 profile with a 2mm tooth pitch and is 6mm wide. It is compatible with standard GT2 pulleys and idlers designed for 6mm belt width. Do not use with MXL, T2.5, or other pitch profiles — tooth geometry differs and will cause skipping.

GT2 2mm pitch 6mm wide closed-loop belts are generally compatible with most desktop FDM 3D printers (such as Ender-style, Prusa-style, and similar Cartesian machines) and small CNC routers that use GT2 pulleys. Always verify the circumference and belt width match your machine's specifications before ordering. If your printer uses an open-ended belt on a carriage, this closed-loop style is typically used on the motor-to-idler loop, not the carriage clamp style.

GT2 rubber timing belts are typically reinforced with a fiberglass or steel cord core, providing good tensile strength for standard 3D printing and light CNC loads. They are generally rated for continuous duty in low-to-medium tension applications. For heavy-duty CNC cutting with high feed forces, verify the load rating with your machine manufacturer. In most 3D printing use cases, a GT2 belt will last many hundreds of hours before showing significant wear.

The rubber compound used in GT2 belts typically offers moderate resistance to moisture and temperature variation, making them suitable for indoor workshop environments. Prolonged outdoor exposure or extreme humidity may accelerate wear over time. For outdoor CNC setups, consider periodic inspection and replacement as part of routine maintenance.

Most Cartesian-style 3D printers use two closed-loop belts — one for the X axis and one for the Y axis — though the required circumference may differ between axes. We recommend ordering at least 2 belts per printer. Buying a 5-pack or 10-pack gives you spares on hand for future maintenance and is more cost-effective per belt.

Closed-loop (endless) belts are pre-formed into a fixed loop with no splice or joint, providing consistent tension and smooth operation. Open-ended belts are sold by the meter and must be cut and clamped to the carriage. Most 3D printers and compact CNC machines use closed-loop belts for the motor-to-idler drive loop on each motion axis.

Divide the millimeter value by 25.4 to get inches. For example: 136mm ÷ 25.4 ≈ 5.35", 150mm ÷ 25.4 ≈ 5.91", 160mm ÷ 25.4 ≈ 6.30", 174mm ÷ 25.4 ≈ 6.85". All sizes in this listing are listed in mm — use this formula to cross-reference with imperial measurements in your machine's manual.