LGX® Lite - Large Gears eXtruder (No Motor) | Bondtech

  • Bondtech LGX Lite extruder
  • Bondtech LGX Lite extruder - Inside front
  • Bondtech LGX Lite extruder - inside back


Bondtech LGX® Lite Large Gears eXtruder (NO MOTOR)

The Bondtech LGX® Lite is based on the LGX® Large Gears eXtruder and uses Bondtech’s new Dual Drive Technology based on larger drive gears. 

Compatible LDO motor available here

Please Note: This extruder only supports 1.75 mm size filament


  • Micro form factor
  • Featherweight
  • Small footprint
  • Powerful filament grip
  • Uses full size LGX® Large Gears for increased filament grip
  • Filament tension lever with 3 presets (open; rigid; flexible) for repeated results
  • Drive wheels maintenance windows for easy cleaning
  • Compact, light & centered filament path for increased performance and compatibility
  • Multiple mounting hole patterns for easy and flexible setup
  • Compatible with Nema14 (36mm) round stepper motors with 10 tooth gear
  • The housing parts are professionally printed with polyamide 12 for maximum strength, precision and higher temperature resistance


  • 1x LGX® Lite feeder
  • 1x 2mm Hex Key (recommended tool)
  • 1x Push-fit collar
  • 1x 30mm PTFE tube to use in the PTFE Tube Adapter
  • 8x M3 square nuts for reinforcing mounting holes

 !!! Please read all the information below for important installation information !!!

Use the LGX® Lite only with a 36mm round stepper motor featuring a 10 tooth motor gear (available here). Otherwise you may cause damages to the extruder that are NOT covered by warranty.

10 teeth motor gear

Extruder and Stepper Motor go together (please note: motor not included in this kit)
Preferably, you should always use the extruder attached directly to the stepper motor when you mount it on a printer.
If you need to put a plate in between the stepper motor and the extruder please notice the max supported thickness is 3mm.

To use a mounting plate in between the stepper motor and the extruder, you need to replace the stock rear plate of the extruder with the mounting plate (thicknesses between 2 and 3mm, preferably 2.5mm).
Don’t use a plate in between without removing the rear plate.
Don't use a plate thicker than 3mm
Multiple mount patterns

The LGX® Lite features 4 mounting patterns:

  • 4 holes at the bottom
  • 2 holes at the right hand side
  • 1 hole at the top plus the filament entry that may be used as anchor
  • 2 holes across, to hold the stepper motor

All except frontal mounting holes on the LGX® Lite require to place a M3 square nut inside the housing to act as reinforcement. The holes with square nuts are M3 thread and 5 mm deep (till bottom of the square nut).

Technical Specifications:

LGX® Lite Extruder

  • E-steps value: 562 using 16 microsteps, 1124 using 32 microsteps.
  • Drive wheels: hardened steel;
  • Materials compatibility: abrasive, rigid, semi-flexible, flexible, and soft.
  • Mounting holes : M3
  • Mounting patterns: bottom (4 points), right (2 points), front to motor (2 points), top (1 point)
  • Hole at the top of the LGX® Lite: 5 mm depth
  • Holes on the side of the LGX® Lite: 5 mm depth
  • Holes on the bottom of the LGX® Lite: 5 mm depth
  • Max tightening torque on the extruder screws is 0.3 Nm
  • Retraction speed: 35 mm/s
  • Retraction distance (bowden) : ~5 mm (0.4 + tube length[mm] x 0.015)
  • Retraction distance (direct drive) for rigid materials: 0.4 mm
  • Retraction distance (direct drive) for soft materials: 3 mm
  • Max Environment operating temperature: 90°C
  • Max stepper motor running temperature: 120℃ / 750 mA
  • LGX® Lite net weight :48 g
  • LGX® Lite with motor net weight: 141 g
  • Package measurements: 80x103x73 mm
  • Package weight: 85f

For Klipper users

rotation_distance = full_steps_per_rotation * microsteps / steps_per_mm
rotation_distance = 200 * 16 / 562
rotation_distance = 5.7
The above calculation assumes the following parameters:

  • stepper motor is a 1.8 degrees motor hence 200 as full steps per rotation
  • microsteps are set to 16
  • e-steps value recommended for the LGX® Lite is 562

Stepper Motor (not included in this kit)

Stepper motor available to purchase here

On the LGX, you must run the stepper motor with currents between ~0.45 and ~0.65A.

!!! Important: Be vigilant regarding the stepper motor surface temperature !!! 
Keep it cool enough to touch. If it is too hot, lower the Vref. (click here for more information).

How to change the current using Vref

It is very hard to read the current being fed to stepper motors. To determine that current we rely on the Vref value. The Vref value is a voltage reference measured in VDC that can be read using a multimeter. It helps us with setting the current output of the stepper motor driver.

Different 3D printer mainboards use different stepper motor drivers. Each type of stepper motor drivers has its own formula to calculate the required Vref to get a specific current. Here are some examples:

TMC stepper drivers:
The formula for these drivers is Vref = ( I * 2.5 ) / Imax
where "I" is the target current value measured in A; and Imax is 1.77 on regular mode and 1.2 on SilentStepSticks mode.

Pololu A4998:
The formula for these drivers is Vref = I * 8 * R, where "I" is the target current value measured in A; and "R" is the Sense Resistor value (this depends on what board are you using. Melzis use 0.1, the Creality Silent boards use 0.15)

Download STEP files here

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