Controling Fan

[Khilborn]

I have the I3 Pro B with the Sang.... board, why can't we control the fan. What I mean is turn it off, change speed, etc? I tested and put in a manual GCode to turn the fan off on the extruder and it does nothing.

[zhangxueyou]

Sorry, there is no any controlling component in fan's circuit, so you can not control it running or not, or its speed. As you turn the printer on , the fan will work too.