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@phaedrux In fact that was the problem. It is working now. I learned something new!! Thank you
@kareka set your tool up to have your part cooling fan specified as part of the tool and then the M106 S255 should work then that tool is selected: https://duet3d.dozuki.com/Wiki/M563 e.g. (adapt this for your existing M563 command):
M563 P0 D0 H1 F0
