Upgrade your printer: Smart fan (BCN3D Sigma)

 

Tools
	Allen key 2mm
	Allen key 2.5mm
	Crosshead screwdriver
	Scissors

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This upgrade is only for the early Sigma units that don't have the new extruder board and cooler fan that only turns on when the hotend has a temperature over 90ºC.

 

Before starting the upgrade, turn off and disconnect the printer.

 

1. Remove the four Allen screws from the hotend and the printed cover.

x2 M3 6mm x2 M3 8mm

2. Remove and slide the cover-up. You can hold the cover like in the following picture.

3. Cut the zip-tie and remove it.

4. Disconnect the cable from the hotend pressing de connector.

 

5. Take the hotend out of the tool head.

6. Remove the flat cable holder unscrewing its Allen screw.

x1 M3 10mm

7. Gently release the latch, first one side and then the other. Remove the flat cable.

 

8. Remove the other cables holder unscrewing the Allen screw. Disconnect the cables of the endstop and the two fans.

 

9. Unscrew the two Phillip screws from the cooler fan and the Allen screw from the toolhead cover. Then, remove the cooler fan.

x2 M3.2 9.5mm

 

10. Take the new fan and make sure its cable is out of the locking tab

 

11. Insert the fan cable through the hole of the corner as the following pictures.

 

12. Make sure to put the fan in the correct position, with the sticker inwards and the cable as the following picture.

13. Screw halfway the two Phillip screws of the cooler fan.

x2 M3.2 9.5mm

14. Remove the two Allen screws and the four nylon washers of the old connection board.

x2 M3 6mm x4

 

15. Take the new connection board with the same screws and washers and screw them on the same metal sheet. The washers have to be on both sides of the connection board.

 

R16 Older Extruder board	R17 | R19 Extruder board

 

16. Connect the two fans and the endstop. Look closely where each one is connected.

17. Position this assembly in its place and screw the holder with the cables well positioned.

Connect the flat cable. First, pull the latch-up gently, then insert de the flat cable in the connector carefully, and finally push the latch down. Make sure the latch is really tight.

 

 

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