It’s almost the end of build. When the extruder will be ready, there will be only few small tasks to do before the printer will print.

Printed parts needed:

1x Modified Extruder body by HeartFoxx
1x Modified Extruder idler by HeartFoxx
1x Extruder cover
1x Fan nozzle
1x Cable holder
1x notORIGINAL extruder motor cover (optional)

Parts from MK2 looks almost same, it even can work – but the diameter of chinese MK8 is a little bit bigger than the original pulley, and this causes problems – and because of that there is a modified version of body and idler.

Extruder body and fan nozzle should be printed from ABS or PETG to avoid future problems – parts from PLA can be easily melted over there (use PLA at your own risk)

Original manual can be followed straight, just use standard M3 nuts instead of the square ones. The slots for probe are too small for nuts – omit the nuts, it will be working without the nuts.

In step 14 – shaft – don’t use additional washers (it’s not needed with the HeartFoxx modification), and for the shaft go with the printed one.

While mounting probe (LJ8A3-2-Z/BX-5V) be careful, as the chinese probe are longer than PINDA one, and it makes harder to put the cable under it.

The additional nut from step 24 are not required – if you have any troubles to put it on the place, just ignore it.

When you will be managing the cables (from step 31) make sure that you know which cable is from the 30×30 fan – because it has to be connected directly to +12V on power supply, only the print fan will be controlled by software.

I didn’t used the spiral wraps/cable shields for my build, if you don’t have it – it will be still OK.

Extruder parts summary

Printed plastic parts

Metal parts

  • 10x M3 nut
  • 4x M3 washer
  • 4x M3x40 screw
  • 3x M3x30 screw
  • 1x M3x25 screw
  • 3x M3x20 screw
  • 6x M3x18 screw
  • 2x M3x10 screw
  • 1x 625ZZ or 625 2RS bearing
  • 2x Extruder spring
  • 1x MK8 pulley


  • 1x NEMA17 stepper motor
  • 1x 5015 turbine fan
  • 1x 30x30x10 fan
  • 1x LJ8A3-2-Z/BX-5V sensor


  • 1x Chinese E3D Bowden Hotend v6
  • 1x PTFE tube
  • 3x zipties (or more)
  • (optional) 1x nylon filament dia 3mm, 50cm length
  • (optional) 1x spiral wrap