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Extruder Fan Need to be on?

I have finally got to testing the 3D functions of the BoXZY and noticed that the user interface allows control of the extruder fan. Also, the generated gcode wants to control the fan as well. The problem I have noticed is that if the fan is off or set low, the extruder can’t heat up. Is this normal for the BoXZY? I know my personal 3D printer has a separate fan for the extruder that is always on but also has a separate fan to cool down the print if needed. I just want to be sure that my unit doesn’t have a wire crossed or something.

thanks…

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Minimum fan speed, officially, should never be less than 8% to keep the cold end of the nozzle cool. However, you should still be able heat the nozzle with the fan off, using the manual control tab. Have you changed the firmware in any way? That would be a difficult error to create via a wiring issue.

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Well, I'll have to look at what I did. I don't think I changed anything with the extruder.

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You may have doubled up on a pin assignment. I've seen an issue like this where extruder 2 had its output pin designated for two different purposes and the result was that the bed would only heat when extruder 2 was heating.

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Hmm... I checked my mods. They are all for the Z probing I added. No doubling up of pins there. Measuring the voltage on my extruder heater I noticed that the fan setting would adjust the voltage on the heater. It also varied the fan speed at the same time. Unfortunately for me, the heater element has opened (burnt out) so I didn't see any other than 0V and 19V depending on the fan and extruder setting in the GUI. The GUI screen displayed this in the graph. I noticed when I adjusted the fan setting, the GUI log window said "Fan compensation_Delta_DT_dt -1.50"

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That makes sense. Yeah, fan compensation increases heater power to compensate for when you crank the fan up, so that the dead time control settings of the heater remain accurate throughout the various levels of cooling the nozzle will see.

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