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Not looking for actual temp control, I want to be able to turn off my Velleman automaticallly when It's done Printing. Can I power it through the spindle interface on the 4-axis board? Just a thought.

Yes sir, i do that too. Just run the 12v thru that relay, and change your coolant pin to 9, then M8 turns it on, and M9 off. Add that to your start/end code and tada!