@GregValiant Thanks for the post and link.
Since that post Cura has evolved a bit and some settings are now obsolète in 5.3.
But I have understood the principles.
I will play with the minimum line width in order to match the desired number of perimeters and get back to "normal" extrusion conditions.
This post and the link it contains to a Reddit post explain why there is no Max Line Width.
A lot of settings can effect how many walls you end up with. Horizontal Expansion, Hole Horizontal Expansion, Outer Wall Inset, etc.
Post a project file and someone will take a look.
This box has 2.4 walls and Cura is set up with a 0.6 nozzle with 0.6 Line Width.
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