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Ed would
12v fan I meant. I would expect Nopheads Marlin to be sorted for this and would suspect the fan.
I have not looked at NopHead's code. But if NopHead is posting code... It is probably very well thought out and it probably works... It's been a while since he has contributed to the Marlin code base, but his finger prints aren't hard to find on it. He knows his stuff!