@arief said in Is there any 8th Extruder Heater output pin?:
Can you give me some guide for set up the fan outputs in RRF3?
See https://duet3d.dozuki.com/Wiki/RepRapFirmware_3_overview. Please note, you will need to wait until I make a new beta available later today in order to configure more than 8 heaters.
Actually I have already using a SSR for drive the Bed Heater, I'm not intend to switch bed heater output to extruder heater output.
I think I need 1 external mosfet more to drive 8th extruder heater as you suggested.
What iImeant is that as you are using an SSR to drive the bed heater, and an SSR input can be driven by a fan output, then using RRF 3 you can reassign heater 0 to to a fan output. Then the bed heater output will be free for your extra extruder heater, and you won't need an external mosfet.
