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Octopus V1.1 part cooling fan won't start


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Running Marlin with BTT TFT35 E3 V3.0 display

The hot end fan (PE5) woks fine - on/off when hot end >50C.  Control fan (PD12) works fine - turns on with axis motion.  The parts cooling fan (PA8) does not come on when printing a part.  I can control it manually (Fan #1) via the display so the fan works.  Can someone point me to what to check to enable automatic operation of the fan?  Yes, it is "on" in the slicer software (Cura).






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