Thanks for the quick response! I didn't explain myself very well. I already had the full Marlin source specifically configured for my UM2 and I knew that the Amedee build didn't support that, so I looked at the source in the Github repository to determine the changes required to support that pin (I just replaced setExtruderAutoFanState in temperature.cpp, and changed EXTRUDER_0_AUTO_FAN_PIN to 255 ) and recompiled.
Maybe I made a mistake or missed something, but after making those changes, the output still doesn't work (although the voltage does change right at the specified hot end temperature). The voltage readings are a bit confusing to me so that's why I wondered if there was a hardware issue.
Thanks for the pointer to the other thread though. I think I'll post something over there as well.
@amedee builder is for umo/umo+ so the bed size, the limit Z and some other settings will be off. To build that clone you will need to make your own firmware or use the one that the thingiverse clone made.
The 2.1.4 5V fan plug has a transistor and to use it you need to read how the firmware works to enable that pin.
This is the dirty code used on um2 to enable that pin
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