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Fan settings in Cura for UM2

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I recently forgot to turn off the fan for an ABS print.  As the print progressed, the fan increased speed as the file instructed it to.  When I turned the fan speed to 0, it returned to the programmed speed after a few seconds.  The only way I could keep it off was to keep the fan speed screen active and set to 0.  What am I missing?  Other settings like print speed or flow % don't get rewritten after I change them.  It has been a while since I updated the firmware on my printer.  Is that it?



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That's a normal behavior. Fan speed is an absolute value, it will be set opnew every time the gcode contains a M106 command (the last one wins...)

The fact that the value from the file is overridden as long as the menu is open... well that's probably just an accidental side effect.


Print speed (on the printer) is an (additional) percentage setting, this behaves different and just multiplies all speed settings from the gcode file with the chosen factor.


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I experimented with the fan speed again last night and am now more confused.


Sure enough, when I set the speed to 75% when the program wanted 20% after a few seconds it went back to 20%. 


Now my question is, if the speed a user selects on the UM2 controller is constantly getting overwritten by the gcode, why is fan speed even an option.  Kind of gives the operator the false idea that he/she has control over something they really don't.

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