@phaedrux said in Print wtih 2 Colling fans:

@mangelli said in Print wtih 2 Colling fans:

M106 S255 P2

Your slicer probably has a setting to tell it which fan to target. If you have it leave off the P value, the duet will just use the fans assigned to the tool.

Yes, the problem was the Slicer`s settings. Thank you so much for your help.
I was looking in the wrong place all the time.