Reply To: Overheating extruder



d8 d9 d10 are interchangeable, one is not normally for the bed. The edits are in several places in the firmware, the easiest is in config.h. just change to a different ramps configuration.
Why would you get a new board, you have 3 ports you only messed up 1, if you are worried you can just replace the mosfet. make sure they are not touching each other.
Yes just a box for the electronics so they can’t get metal chips on them or touched. Make sure it is vented and preferably with a fan, this generates a lot of heat.