Biqu Nebula Dual Gear Extruder

BIQU Nebula Dual Gear Extruder — 6KG+ Extrusion Force, Planetary Gearbox, RGB Status, Built-in Filament Sensor, LGX Lite Footprint, Voron StealthBurner and EVA3 Compatible

The BIQU Nebula is a direct-drive dual-gear extruder built around a precision planetary gear reduction system with large-diameter hardened steel drive gears — delivering over 6KG of stable extrusion force in a 143g lightweight package that mounts on the same footprint as the LGX Lite. It's designed as a drop-in upgrade for Voron Stealthburner, EVA3, and any LGX Lite-compatible toolhead — adding built-in filament sensing, one-button auto load/unload, programmable RGB status lighting, and a transparent magnetic front cover for filament path visibility, all without adding significant mass to the toolhead.

⚠️ Motor not included. The Nebula ships as an extruder body — you will need a compatible stepper motor. Verify motor compatibility with the LGX Lite motor spec for your toolhead.
⚠️ Printed mounting brackets may be required for toolheads other than Stealthburner and EVA3. Open-source models are available for community-designed brackets.
⚠️ Max recommended stepper current: use within your toolboard's rated limits. Compatible with EBB36 and EBB42 CAN toolboards.

Planetary Gear Reduction + Large-Diameter Dual Drive — 6KG+ Force

The Nebula's extrusion force comes from two compounding advantages: a precision planetary gear reduction system that multiplies motor torque mechanically, and large-diameter hardened steel dual drive gears that maximize the filament contact surface on both sides simultaneously. The combination delivers over 6KG of stable extrusion force — sufficient to feed the most demanding engineering filaments through long Bowden runs or tight hotends at high speed, with virtually zero slip on flexible materials like TPU that defeat single-gear extruders at elevated feed rates. The dual-drive geometry also ensures the filament path is centered and constrained, reducing the lateral wobble that causes extrusion artifacts at high speed.

Built-in Filament Sensor + G-code Button — Auto Load and One-Button Unload

The Nebula integrates a filament sensor directly in the extruder body — when filament is inserted, the sensor triggers an automatic loading sequence immediately. No manual commands, no console interaction required. A dedicated G-code button on the extruder body triggers the unload sequence with a single press — executing a configurable macro that can include purging, preheating, print pause, or any other action you define in Klipper. Both the load and unload behaviors are fully configurable via the provided Klipper macros (see Resources), making the Nebula as useful for multi-material setups with external filament changers as it is for single-material printing.

Programmable RGB Status Lighting — 16 Million Colors

Two onboard NeoPixels (Klipper pin: EBBCan:PD3, chain_count: 2, color_order: GRB) give the Nebula programmable RGB lighting across 16 million color options — compatible with the klipper-led_effect plugin for animated status indication. Set different colors for heating, printing, filament runout, and print completion — visible across the room without checking a screen. For builders who use RGB consistently across their toolhead setup, the Nebula matches the Stealthburner Neopixel aesthetic cleanly.

LGX Lite Footprint — Drop-In for Stealthburner and EVA3

The Nebula uses the same mounting hole pattern as the Bondtech LGX Lite — meaning every toolhead designed around LGX Lite geometry accepts the Nebula without printed part modifications. This includes the Voron Stealthburner and EVA3 as primary targets, plus any community toolhead designed for LGX Lite compatibility. Open-source appearance models are available for builders who want to design custom mounting brackets for other applications.

POM Housing — Heat-Resistant, Dimensionally Stable in Enclosed Printers

The Nebula's housing is made from POM (Polyoxymethylene) — a high-strength engineering polymer with excellent dimensional stability at elevated temperatures. Unlike printed ABS or ASA extruder bodies that can warp or creep under sustained heat from an enclosed chamber, POM maintains its geometry reliably in hot-chamber environments, preventing the gear misalignment that develops in plastic-bodied extruders over time. At 143g total weight, the Nebula adds minimal inertia to the toolhead — important for CoreXY printers running high-acceleration profiles where toolhead mass directly impacts print quality.

Transparent Magnetic Front Cover — Tool-Free Access

The extruder's front shell uses a transparent magnetic quick-release design that snaps on and off without tools. The transparent panel lets you visually monitor filament engagement and gear contact in real time without disassembling anything. When you need to clear a jam or inspect the drive gears, the cover removes in seconds with no screws — a meaningful quality-of-life feature on an extruder that runs as many load/unload cycles as a direct drive unit does.

Specifications

What's Included

What's NOT Included

Klipper Configuration — RGB and Filament Sensor

Full Klipper config including NeoPixel setup, filament sensor macros, and the auto load/unload G-code scripts are available in the official BTT Wiki documentation. The load and unload distances, speeds, and purge parameters are all configurable via the _NEBULA_VARIABLE macro section.

When Do You Need This?

The Nebula is the right choice if you're building or upgrading a Stealthburner or EVA3 toolhead and want an extruder that combines serious extrusion force with practical quality-of-life features — filament sensing, one-button unload, and RGB status — without adding weight that compromises acceleration performance. At 143g, it's competitive with the LGX Lite it physically replaces, while adding the sensor and RGB ecosystem that the LGX Lite lacks. It's also the correct pick for builders who want their extruder to integrate cleanly with EBB toolboard workflows in Klipper.

Resources

• BIQU Nebula Wiki — Klipper config, RGB setup, filament sensor macros, G-code button config
• klipper-led_effect — animated LED effects plugin for Nebula NeoPixels

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