Mellow Hardened Steel Double Helical Drive Gear Kit – Libra

Mellow Hardened Steel Double Helical Drive Gear Kit for Libra Mini Extruder

Upgrade your 3D printer's filament feeding system with the Mellow Double Helical Drive Gear Kit — precision-engineered for the Libra Mini Extruder. Crafted from hardened steel (HRC 55) and machined on high-precision CNC equipment, these gears are built to deliver consistent, reliable performance across extended print sessions. Made in Mainland China.

Why Choose the Mellow Double Helical Drive Gear Kit?

• Hardened Steel Construction (HRC 55): Exceptional durability ensures the gears resist wear from abrasive filaments, maintaining sharp teeth and consistent grip over thousands of print hours.
• Double Helical Gear Design ("Heart of Balance"): The dual helical tooth profile distributes filament stress evenly during high-speed printing, significantly reducing vibration-induced print artifacts and ringing lines.
• CNC Precision-Machined: Every gear is produced with tight tolerances — no burrs, no uneven teeth — preventing filament from lodging in the gear and eliminating extruder slippage.
• Improved Extruder Performance: The enhanced grip and balanced load transfer directly boost overall extruder reliability, especially during fast or demanding print runs.
• Ideal for DIY Extruder Builders: This gear kit is also perfect for makers designing their own custom extruder setups, giving your project a high-quality, battle-tested drive gear at its core.

What's in the Box?

• Libra gear without lock screw × 1 (Hardened Steel)
• Libra gear with lock screw × 1 (Hardened Steel)
• Pulley shaft × 1 (3mm × 20mm)
• Pulley bearings × 2

Note: Assembly required.

Specifications

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Frequently Asked Questions

Q: Which extruder is this Mellow double helical drive gear kit compatible with?

A: This gear kit is specifically designed for the Libra Mini Extruder. It can also be used by makers who are building or customizing their own extruder designs, provided the gear dimensions match their build requirements.

Q: What makes double helical gears better than standard spur gears for 3D printing?

A: Double helical gears distribute the load across the filament more evenly, which reduces vibration during high-speed printing. This minimizes visible "ringing" or vibration artifacts on printed parts, resulting in smoother surface quality compared to standard spur gear extruders.

Q: Will these gears work with abrasive filaments like carbon fiber or glow-in-the-dark PLA?

A: Yes. The gears are machined from hardened steel at HRC 55, which makes them significantly more resistant to wear from abrasive filaments than standard brass or mild steel gears. They are well-suited for long-term use with challenging materials.

Q: Does this kit include everything needed to install the gears?

A: The kit includes two hardened steel Libra gears (one with lock screw, one without), a 3mm × 20mm pulley shaft, and two pulley bearings. Some assembly is required. Please ensure you have the appropriate tools on hand before installation.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.