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Thx, guys. Much info here. I will consider my options and get back to you with the design. However, I will probably add a 30mm fan (powered by the input 12V) as I plan longer runs (engraver setup)

Talking about Arctic Silver, did you tape-cover the whole board or just the input/output pads?

I guess putting a thermal pad underneath the whole board should be enough to electrically insulate the contacts. If I understand well, thermal pads (I have some Chinese blue ones) should work fine covering both insulation and heat transfer.

Thx for the prompt reply! I was thinking of using a thermal pad and screws to fix the driver to the alu heatsink. Did you use any heatsink(s) on the top side (components)? About the fan - yes I will find a suitable 12v 30mm fan and hook it up to the 12v driver source. I was just wondering about...

I know this is an old thread, but the questions are related... What is finally your result of running the controller 4.5+ Amps? I'm making the same build one of these days so I am concerned. Also, as I will use external PWM I will not use the 5v out for adjusting Laser power - so is it safe...