{"product_id":"mellow-hardened-steel-double-helical-drive-gear-kit-libra-extruder","title":"Mellow Hardened Steel Double Helical Drive Gear Kit – Libra","description":"\n\u003ch2\u003eMellow Hardened Steel Double Helical Drive Gear Kit for Libra Mini Extruder\u003c\/h2\u003e\n\u003cp\u003eUpgrade your 3D printer's filament feeding system with the \u003cstrong\u003eMellow Double Helical Drive Gear Kit\u003c\/strong\u003e — precision-engineered for the \u003cstrong\u003eLibra Mini Extruder\u003c\/strong\u003e. Crafted from \u003cstrong\u003ehardened steel (HRC 55)\u003c\/strong\u003e and machined on high-precision CNC equipment, these gears are built to deliver consistent, reliable performance across extended print sessions. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose the Mellow Double Helical Drive Gear Kit?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHardened Steel Construction (HRC 55):\u003c\/strong\u003e Exceptional durability ensures the gears resist wear from abrasive filaments, maintaining sharp teeth and consistent grip over thousands of print hours.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDouble Helical Gear Design (\"Heart of Balance\"):\u003c\/strong\u003e The dual helical tooth profile distributes filament stress evenly during high-speed printing, significantly reducing vibration-induced print artifacts and ringing lines.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCNC Precision-Machined:\u003c\/strong\u003e Every gear is produced with tight tolerances — no burrs, no uneven teeth — preventing filament from lodging in the gear and eliminating extruder slippage.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eImproved Extruder Performance:\u003c\/strong\u003e The enhanced grip and balanced load transfer directly boost overall extruder reliability, especially during fast or demanding print runs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIdeal for DIY Extruder Builders:\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eLibra gear \u003cem\u003ewithout\u003c\/em\u003e lock screw × 1 (Hardened Steel)\u003c\/li\u003e\n  \u003cli\u003eLibra gear \u003cem\u003ewith\u003c\/em\u003e lock screw × 1 (Hardened Steel)\u003c\/li\u003e\n  \u003cli\u003ePulley shaft × 1 (3mm × 20mm)\u003c\/li\u003e\n  \u003cli\u003ePulley bearings × 2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: Assembly required.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMellow\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHardened Steel (HRC 55)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGear Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDouble Helical \/ J-Head\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7LHDG\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible With\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLibra Mini Extruder\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAssembly Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eExplore More Workshop \u0026amp; Build Essentials\u003c\/h3\u003e\n\u003cp\u003eLooking for more precision tools and hardware for your projects? Check out these related items from our store:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10-pack-65mm-oscillating-multi-tool-saw-blades-high-carbon-steel\"\u003e10-Pack 65mm Oscillating Multi-Tool Saw Blades | Carbon Steel\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/ball-end-hex-screwdriver-bit-magnetic-reduced-shank-steel\"\u003eBall End Hex Screwdriver Bit – Magnetic Reduced Shank Steel\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/adjustable-woodworking-compass-layout-gauge-carpenter\"\u003eAdjustable Woodworking Compass Layout Gauge for Carpenters\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Which extruder is this Mellow double helical drive gear kit compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This gear kit is specifically designed for the \u003cstrong\u003eLibra Mini Extruder\u003c\/strong\u003e. It can also be used by makers who are building or customizing their own extruder designs, provided the gear dimensions match their build requirements.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What makes double helical gears better than standard spur gears for 3D printing?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Will these gears work with abrasive filaments like carbon fiber or glow-in-the-dark PLA?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this kit include everything needed to install the gears?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo 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.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Which extruder is this Mellow double helical drive gear kit compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This gear kit is specifically designed for the Libra Mini Extruder. 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