How to change the extruder board (BCN3D Sigmax)

If you need to change the extruder board on your BCN3D Sigmax, follow the steps explained in this guide.





Allen key 2 mm

Allen key 2.5 mm


1. Remove the two Allen screws from the connection cover. Remove and slide the cover-up. You can hold the cover as the following picture. screw-icon x2 M3 12mm
New Project (1) (1) connection-cover-2-sigmax


2. Disconnect the cables of the hotend, the endstop and the two fans. Also carefully open the clip of the flat cable and disconnect it.

Annotation 2020-07-22 111639 Annotation 2020-07-22 111639 (1) _MG_2665 (3)


3. Remove the extruder board unscrewing the Allen screws. screw-icon x2 M3 6mm
New Project (1) (2) (1) New Project (1) (2) (2)


4. Unfasten the two screws holding the extruder board, making sure to keep the nylon washers.

screw-icon x2 M3 6mm

washer-icon x4

extruder-board-washers-2-bcn3d extruder-board-washers-bcn3d


5. To reassemble the new extruder board, follow these instructions in reverse order. Don't forget to install the nylon washers  before reinstalling the extruder board.



To reassemble the component, follow the above steps in reverse order.

Forum community 

Repair didn’t go as planned? Check out our forum community for troubleshooting help.


It's important to keep your printer in good shape to make the most out of it. In this chart you can find a list of the extruder maintenace procedures and how frequently these should be done. Maintenance Plan


bcn3d-recycle    Take your e-waste to an R2 or e-Stewards certified recycler.


Parts   Buy these parts
old-extruder-board-bcn3d Sigmax - R17 | R19 Extruder Board SKU