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Are you sure you mean Fan2 ? The fan output that is on by default on the Duet WiFi is Fan 1.
Of course, if you are inverting the fan output to drive the laser, then off by default becomes on by default.
You'll need the Printer Settings plugin from the Cura plugin marketplace. That will add another menu in the settings bar. That's where you'll find the option for firmware retraction. I should have remembered that earlier. Sorry.
Thank you for your answers. I will definitely try the suggestions and reply, but for now I have to solve another issue first: https://forum.duet3d.com/topic/14954/volumetric-extrusion-massive-overextrusion