@kalle Try M106 S255 instead. The analogWrite is 8-bit PWM so valid values are 0-255. The 256 may be causing a toggle between digital high and low which might appear to be 50% duty cycle but if this is the case then I’m not sure why it isn’t affecting the 12v Mosfet output on D9. Just a suggestion, it’s quick and easy so try it and report back.
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