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Add feature to allow control of hotend fan
It would be good to have software / firmware control of the always-on hotend fan. Currently these are just wired to constant power on the board but a controllable pin that cuts power when the hotend is below a safe threshold would be better. That way when a print is complete and the hotend cools completely the fan could shut off automatically, reducing noise and extending the life of the fan.
Not sure if this requires a hardware redesign or not. Would definitely require a corresponding firmware modification. There is precedent for this feature in Repetier firmware w/ RAMBO boards.
Further discussion here: http://www.printrbottalk.com/forum/viewtopic.php?f=21&t=10508&p=67897&hilit=fan+mosfet#p67897