Descrizione
In extrusion, grip is everything. A filament drive that slips on retraction will turn a 12-hour print into a string-filled failure at hour 11, and the only variable that matters is how consistently the idler gear engages the filament surface. The Dual Grip BMG extruder takes the proven gear-reduction architecture of the Bondtech BMG design and delivers it in a precision-clone format. The dual-drive gears grip the filament from both sides, eliminating the single-drive slippage that causes underextrusion on long retraction moves in Bowden setups. The 3:1 gear reduction trades raw speed for torque, translating each stepper microstep into a precise filament displacement that the hot end can reliably melt and deposit.
The housing is machined from 6061 aluminum, providing the thermal dissipation and structural rigidity that stock plastic extruder bodies lack. Plastic extruders develop hairline cracks around the idler screw over time, introducing a wobble that no firmware calibration can correct. The aluminum body eliminates this failure mode entirely. The gear set uses hardened steel drive wheels with a serrated tooth pattern optimized for PLA and PETG, while the idler bearing runs on a sealed cartridge that collects less dust and debris than the open bearing of the original design.
Installation is a direct swap for Creality and Anet-style direct drive and Bowden setups using the standard 42-40 stepper motor mounting pattern. The package includes the full extruder body assembly, both drive gears, the idler arm, and mounting hardware. The existing stepper motor and hot end assembly carry over, making this a 15-minute upgrade that transforms print reliability on every subsequent job.
This is not a replacement part. It is the upgrade that fixes the extruder before it fails a print.
Key Features
- ✦ Dual-drive gear system grips filament from both sides for zero-slip retraction
- ✦ 3:1 gear reduction delivers precise torque multiplication for consistent extrusion
- ✦ 6061 aluminum housing eliminates the cracking failure mode of plastic extruders
- ✦ Hardened steel drive gears with serrated tooth pattern for PLA and PETG
- ✦ Sealed cartridge idler bearing reduces dust accumulation and extends service life
- ✦ Direct replacement for Creality, Anet, and standard 42-40 stepper mounting
- ✦ Complete assembly: body, gears, idler arm, and mounting hardware included
Technical Specifications
- Gear Ratio: 3:1 reduction
- Drive Type: Dual opposed gear (filament gripped from both sides)
- Housing Material: 6061 aluminum, anodized finish
- Drive Gears: Hardened steel with serrated tooth profile
- Idler Bearing: Sealed cartridge, stainless steel
- Filament Compatibility: 1.75 mm PLA, PETG, ABS, TPU, Nylon
- Mounting Pattern: Standard 42-40 stepper motor, direct replacement for MK8/MK10
- Includes: Extruder body, dual gears, idler arm, springs, mounting screws
Who It Is Made For
The Dual Grip extruder is for the 3D printing enthusiast who has spent hours diagnosing intermittent underextrusion only to find that the stock plastic extruder arm has developed a hairline crack that opens under spring tension. It is for the small print farm operator running 24-hour production cycles where every gram of filament must be deposited exactly where the G-code commands, and for the hobbyist upgrading from a single-drive extruder who wants the first-layer consistency that makes the difference between a failed benchy and a flawless one.
Frequently Asked Questions
Q: Will this fit my Ender 3 / CR-10 / Voxelab Aquila?
A: Yes. The mounting hole pattern matches the standard 42-40 stepper motor used on Creality, Anet, and most open-frame printers. It is a direct bolt-on replacement for the stock MK8 extruder assembly.
Q: Does this clone have the same performance as the original Bondtech BMG?
A: The original Bondtech BMG uses a specific gear material and surface treatment that this clone approximates at a fraction of the cost. For most users printing PLA, PETG, and standard filaments at moderate speeds, the performance difference is negligible. For production-grade or exotic materials, the original Bondtech is recommended.
Q: What is the maximum filament diameter this extruder can handle?
A: The dual-gear path is designed for 1.75 mm filament. It cannot accommodate 2.85 mm filament or larger diameters.
Q: Do I need to calibrate e-steps after installation?
A: Yes. Switching from a single-drive to a dual-drive extruder changes the effective filament displacement per stepper rotation. Calibrate e-steps using the standard 100 mm extrusion test before your first print.
Q: Does the aluminum body add significant weight to the print head?
A: The aluminum body is slightly heavier than the stock plastic extruder (approximately 15 g more). On a direct-drive carriage with a heavy stepper motor, this difference is negligible. On a lightweight printer or a highly accelerated build plate, the mass increase is worth noting but not problematic.
Q: Can I use this for flexible filaments like TPU?
A: Yes. The dual-drive eliminates the filament path curvature that causes TPU buckling in single-drive extruders. Keep the retraction distance under 3 mm to avoid grinding the soft filament.
Q: How do I tension the idler spring correctly?
A: Tighten the idler screw until the gears just start to grip the filament without visible deformation of the filament cross-section. For PLA, the minimal tension that prevents slip during retraction is sufficient. For TPU, reduce tension slightly to avoid chewing the filament surface.
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