I have a P178 and wasn’t able to get a fan to work on D9 (ramps 1.4).
Changing the firmware to sprinter did it. But know I have some issues with the temperature and I am not sure
what else I need to configure.
Does anyone have the configuration settings I would need for sprinter or marlin?
I tried changing back to Marlin, but pronterface doesn’t connect.
Any help would be appreciated.

Figured it out and it works really well.