BondTech LGX for the MK3S & Mosquito

Direct drive upgrade for the MK3S & Mosquito hotends


  • Easy installation
  • Strong filament handle
  • Maintenance window
  • $186.66

All prices excl. VAT. Excludes delivery costs

Dispatch on 12.10.2021 - Pre-order possible

Content: 1 pc

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Item no.: BTE-EXT-KIT-84, Content: 1 pc

EAN: 7350011414789

  • Easy installation
  • Strong filament handle
  • Maintenance window

Product information & technical details

Item no.: BTE-EXT-KIT-84
Manufacturer No.: EXT-KIT-84
Manufacturers: BondTech
Content: 1 pc
Product types: Extruder
Extruder type: Direct Drive Extruder


Direct drive upgrade

This LGX upgrade kit replaces the standard direct drive extruder. It's a very intuitive and easy to install upgrade kit with the extruder facing the X-Carriage, reducing the distance between the nozzle and the X-axis.

Due to the large drive wheels, the Bondtech extruder has a very strong filament handle.


  • Larger drive wheels for increased filament grip
  • Pre-tensioned lever, for repeatable results
  • Multifunction interface socket
  • Drive wheel maintenance window for easy cleaning
  • Compact, lightweight and symmetrical design for greater performance and compatibility
  • Multiple mounting hole patterns for an easy and flexible setup
  • You can find more information about the individual properties here.

Housing 3D printed with PA12

The housing parts have been professionally printed with nylon and ensure maximum strength, precision and higher temperature resistance.

Working temperature limits

  • Stepper motor> up to 80 ° C
  • The PA12 parts themselves can withstand up to 100 ° C

MMU compatibility

This upgrade kit is not compatible with any version of the MMU.

Custom firmware required

Your Prusa firmware must be updated to use this product.

You can find more information about the firmware here.

Technical specification

  • E-step value: 400 at 16 microsteps
  • Drive wheels: Hardened steel
  • Retraction speed: 35 mm / s
  • Retraction path (direct drive) for rigid materials: 0.4 mm
  • Retraction path (direct drive) for soft materials: 3 mm
  • Maximum operating temperature: 70 ° C
  • Maximum tightening torque of the extruder screws: 0.3 Nm
  • Maximum tightening torque of the heat sink / cooling block screw: 0.6 Nm
  • Net weight of the extruder: 218.6 g
  • Package dimensions: 80 x 103 x 73 mm
  • Package weight: 269 g

A compatible X-Carriage and a suitable hotend are required.


Questions & Answers about BondTech LGX for the MK3S & Mosquito

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Customer Reviews

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Did you know?

Since March 2017, a 3D printer has been stationed on the ISS space station.