Bondtech LGX Shortcut Copperhead for Prusa MK3S


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This is a LGX Shortcut Upgrade Kit to use on Prusa MK3S and MK3S+.
It uses a short Copperhead hotend from Slice Engineering with a Bondtech heatsink.

Requires a X-carriage
You may download the x-carriage model, change it and/or print it yourself.

Product Includes:

  • LGX® Large Gears eXtruder
  • LGX Shortcut Copperhead Hotend
  • LGX Shortcut Copperhead Accessories For MK3S

Master All Materials * Excel With Flexibles
The LGX Shortcut Copperhead Print Head is a special unit that includes the LGX™ Large Gears eXtruder and the LGX Shortcut short filament path Copperhead hotend, that will master all materials and excel with the soft and flexible.

Direct Drive Upgrade
This LGX based upgrade kit is a easy to install replacement of the stock direct drive extruder. It requires the accessories included in the LGX Shortcut Copperhead Accessories for Prusa MK3S package and the LGX Shortcut Mosquito hotend.

Easy To Install
Very intuitive and easy to install upgrade kit where the extruder faces the X-carriage reducing the distance between the nozzle and the x-axis.

Leading Grip Power
The LGX is the Bondtech extruder with the highest filament grip due to its new large drive wheels that put more teeth engaging the filament.

MMU Compatibility
This upgrade kit is not compatible with any MMU version.

Custom Firmware Required
You need to update your Prusa’s firmware to use this product.

New Firmware Available.
Open the Firmware tab on the Bondtech site to download.

Enjoy Bondtech’s Evolved Dual Drive Technology
Start using our newest extruder with our new Dual Drive Technology based on larger drive gears. This is only one of the 7 new features Bondtech implemented on an extruder.

7 new features on a Bondtech eXtruder:

  • Larger drive wheels, for increased filament grip;
  • Filament pre-tension lever, for repeated results;
  • Multi-function interface socket, for tool or application quick swap;
  • Drive wheels’ maintenance windows, for easy cleaning;
  • Compact, light & symmetric design, for increased performance and compatibility;
  • Multiple mounting hole patterns, for easy and flexible setup;
  • A small step for a greener Future, craft boxes without bleaching & no coating.

3D Printed Housing using PA12

The housing parts are professionally printed with nylon for maximum strength and precision and higher temperature resistance.

Compatible nozzles
The hot block included in this product is compatible with the RepRap standard of nozzles.

Technical Specification

  • e-steps value : 400 using 16 microsteps;
  • Drive wheels : hardened steel;
  • retraction speed : 35 mm/s
  • retraction distance (direct drive) for rigid materials : 0.4 mm
  • retraction distance (direct drive) for soft materials : 3 mm
  • Max operating temperature : 70°C
  • Max tightening torque on the extruder screws is 0.3 Nm
  • Max tightening torque on the heatsink/cold block screw is 0.6 Nm
  • LGX™ DD net weight : 218.6 g
  • Package measurements : 80x103x73 mm
  • Package weight : 269 g


  • Requires cable with PHR-6 connector
  • 2 phases
  • DC 3.1 V
  • Max 0.7A / phase

To use the LGX, run the stepper motor with currents between ~0.45 and ~0.65A:

Be vigilant regarding the stepper motor surface temperature.
Keep it cool enough to touch. Lower Vref otherwise.

Class H motor, rated up to 180°C

  • Max recommended environment : 70°C
  • Max temperature at this environment temperature can go up to 130°C on account of the self heating.
  • Download the stepper motor Technical Data Sheet here.

Buy a LGX Shortcut Upgrade Kit from Spool3D for your 3D printer in Canada without the surprise cost of the exchange rate!



5 out of 5 (based on 1 rating)
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LGX Shortcut Copperhead

This unit has been excellent over the last year or better I have been using it.. other than cleaning the heat sink, normal maintenance, no issues.. I did manage to create a blob last night.. using PETG, on a smooth PEI plate.. thought i was safe I was on 3rd layer and walked away.. ZZ time.. but with some patience I recovered and removed the blob.. only a tiny bit of damage to the Fan Duct, I have been told by Bondtech, they will send me the STL to make a new one.. would be nice to be able to order this parts as well.. since they are SLS and very nicely made.. I would of chosen the Mosquito now.. it wasn't for sale when I bought this.. only because the hotend is secured for nozzle wrench only changes.. this still needs two tools..
Posted by Andrew, January 19, 2023