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I am a bit confused about fans in Marlin. In the configuration.h files, I found where you can enable a fan to come on when the steppers are active. In the pin.h file, if you have motherboard 33, it uses D9 for fan. If you setup motherboard 34 for dual extrusion, it sets pin 4 for fan and you need a buffer. In slic3r, you can set parameters for a fan that cools the printed material.

So, which pins are for which fan?