Bondtech LGX PRO Large Gears eXtruder

Bondtech LGX PRO Metal Extruder — Full Steel Drive Train, Large Gear Dual Drive, Industrial-Grade 1.75mm Filament Feeder

The Bondtech LGX PRO Metal is the industrial-hardened evolution of the LGX Large Gears eXtruder — rebuilt from the inside out for demanding environments, high-temperature applications, and sustained high-cycle use where the standard LGX would show wear. Every structural and mechanical component has been upgraded: steel replaces plastic in the drive train, aluminum replaces printed housing, and the large gear Dual Drive geometry is retained for the grip and feed consistency that made the LGX platform a benchmark for precision extrusion.

⚠️ 1.75mm filament only. This extruder does not support 2.85mm.
⚠️ No mount plate between motor and extruder body. The LGX PRO Metal does not accept an adapter plate between the stepper and the feeder — direct motor mounting only.
⚠️ Motor stud threads are aluminum — use finger force only. The M3x23mm mounting studs thread into aluminum. Do not apply torque with tools; use finger force to avoid stripping.
⚠️ Check wiring before connecting to your printer. Not all printers are wired for direct LGX motor connection. Verify pin order matches before powering on.
⚠️ Max motor current: 1A (RMS). Do not exceed 1A to the included stepper motor.

Full Steel Drive Train — The Core Upgrade Over Standard LGX

The standard Bondtech LGX uses a drive train with printed nylon components — excellent for desktop printing, but showing wear under sustained industrial loads, abrasive filaments, and high-temperature environments where housing and gear temperatures elevate. The LGX PRO Metal replaces the entire drive train with full steel components — harder, more dimensionally stable under thermal stress, and significantly more resistant to wear from abrasive filaments like CF, GF, and particle-loaded composites. The steel drive train is what enables this extruder to sustain consistent grip force and precise feed rates across long production runs without the gradual performance degradation that plastic components experience.

Bondtech Dual Drive Technology — Large Gear Geometry for Maximum Grip

All LGX extruders are built on Bondtech's Dual Drive Technology with large diameter drive gears — the design that distinguishes the LGX platform from BMG and similar compact dual-drive designs. Larger drive gears increase the filament contact arc, distributing grip force over a larger surface area rather than a concentrated pinch point. The result is more consistent filament engagement, reduced slippage on flexible and abrasive materials, and lower risk of grinding even when running at elevated feed rates. On the PRO Metal, this geometry is implemented entirely in steel for the contact components — combining the large gear advantage with the durability of metal at every wear point.

Aluminum Housing — Higher Thermal and Mechanical Resistance

The LGX PRO Metal uses an aluminum housing rather than the nylon housing of the standard LGX. Aluminum provides significantly higher thermal resistance — critical for enclosed high-temperature printing environments where chamber temps can reach 60–80°C and the extruder body must maintain dimensional stability throughout. Aluminum also offers better protection against dust and particle-saturated industrial environments where printed nylon housings can absorb moisture or degrade over time. The result is an extruder that maintains its fit and mechanical precision across more demanding operating conditions.

Pre-Tension Lever with 5 Presets — Calibrated Grip for Any Filament Type

The LGX PRO Metal includes the same pre-tension mechanism with 5 selectable presets as the standard LGX — open, rigid, hard rigid/semi-flexible, flexible, and soft flexible. Each preset adjusts the drive gear clamping force on the filament to match the material's mechanical properties. Running a soft TPU at the same tension as a rigid PLA-CF causes slippage or grinding; the preset system removes the guesswork and lets you dial in correct tension for each material type with a single lever movement.

Aluminum Interface Plug — Included Free, Supports Longer Hotends

Every LGX PRO Metal ships with a free Aluminum Interface Plug that extends the hotend mounting range to accommodate longer hotends in direct drive configurations — useful when running volcano-style or extended melt-zone hotends that exceed the standard mounting depth. The aluminum construction of the plug matches the thermal resistance of the extruder housing.

Specifications

What's Included

LGX PRO Metal vs Standard LGX — Key Differences

When Do You Need This?

The LGX PRO Metal is the correct extruder when the standard LGX is your bottleneck — specifically in enclosed chambers running sustained high temperatures, in environments with significant airborne particles or dust, or in continuous production contexts where you need the extruder to perform identically on print 500 as it did on print 1. It's also the direct choice when running heavily abrasive filaments (CF composites, GF composites, metal-filled) at high feed rates over long sessions — the steel drive train won't show the wear pattern that the standard LGX eventually develops under those conditions. If you're building a workhorse machine rather than a hobby printer, this is the extruder that matches that requirement.

Resources

• Bondtech LGX PRO — official documentation, setup guides, STEP files, wiring instructions

Browse our full extruder selection at 3D Printer Extruders, or explore all drivetrain upgrades at 3D Printer Upgrades.