How to change the hotend (BCN3D Sigmax)

The Sigmax is equipped with two 0.4 mm hotends. However, it is possible to change the hotend in order to increase the versatility of the 3D printer. Every part has its particularities and needs, so it’s wise to choose the proper hotend for each print job. The sizes of the hotends compatible with the Sigmax are:

0.3  / 0.4 / 0.5 / 0.6 / 0.8 / 1.0 mm.

You can find them in our store. Small nozzles are ideal for detailed models. Instead, big nozzles allow users to fabricate more resistant parts or for rapid prints.

Notice that 0.5 hotend is specially designed for material-filled filaments, such as carbon fiber, metal etc.

To change the hotend you will need:

  • Scissors or cutting pliers
  • 2,5mm hex key
  • Pliers
  • Zip ties

Operating the printer via the LCD screen, go to Utilities --> Printer setup --> Change hotend.

printer setup screen

Select the hotend to change and unload the filament (in case there’s some loaded).

Change hotend screen

Wait while the hotend cools down. Turn off the Sigma when the LCD indicates it.

Turn off printer

Remove the black clip. Then hold down the coupling collet and pull out the teflon tube.

bowden clip and bowden tube

Unscrew the cover and remove it.


Unscrew the hotend.

Unscrew 2

Cut the zip tie and remove it.

cut tie

At the back of the toolhead carriage, press the connector to remove the cable of the hotend.


Remove the old hotend and place the new one, connecting it at the back of the toolhead carriage.

eboard 2

Place and adjust the zip tie, cutting off the excess.

tie wrap 2

Screw the hotend, place the cover and screw it, making sure that the fan and endstop cables are routed correctly to prevent any damage.


Insert the teflon tube until it stops, making sure it is well placed. Put back the black clip.

coupling tube

Turn on the Sigma and follow the screen instructions. Select the hotend size you have installed.

hotend size

Load filament and perform an autotune operation. Then, calibrate the offset between hotends.




clean hotend eng


manually unload filament eng



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