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Got my printing doing some test prints today. On my third print of the day using PLA(60C bed) im about 2 hours in and the SMD board is staying below 90F. I have not changed from the stock relay sw configuration yet but it seems I over engineered my torture tests at work.
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Got PID control setup on the Heated Bed, the switching frequency is much lower then I had expected (only 7.633Hz). Other then some hot wires(need to increase # of wires from ATX supply to bed) everything is nice and cool.
http://i.imgur.com/SNbmNxN.jpg