Can you all talk to the fans and fan positions/ adapters you have on your Herculien around the extruder? I currently have the fan that came with the E3D Volcano, and it runs constantly. I have a second fan that is on the carriage, but I have it disabled because it seemed to be messing up my extruder. Any relevant pictures would be appreciated.
Also, when I got the plastic parts to build my printer I received a part that does not seem to fit any of my fans, but I could modify now that I am printing decent parts.
I do recall an older thread that I will revist when @Eclsnowman advised on how to hook up the fan(s) so they could be controlled to turn on later in the print cycle.
You can setup the hotend heatsink fans to come on when the hotend reaches a specific temp (normally around 50C). If you look at my old Marlin configs, or my Smoothie configs you will see it in there.
For the part cooling fans (and the duct you see in the pictures) that is a separate output on the controller. It really depends on what board you used and how you set it up. For example if you set the heatsink fan off main 24v supply then they will always be on. I instead used a spare mosfet output, so it could be turn off when the hotend isn’t at temp to save some life on the fans.