It is the wall size I tried for 0.35. In the 1.5x version usually 0.38 was good enough to get the 0.4mm details in. Since the difference between 0.4 nozzle size and 0.38 wall size is relatively low there are no extrusion issues.
But if on 2.3x this does not work at all I do have an issue here. The rule that you can't go below 2x nozzle size would be stupid since single wall objects are still quite usable.
Where did you "try .35"? You need to try smaller values in the "line width" part of cura 2.3. It's similar to the old "nozzle size" in cura 15.X
People will tell you cura won't go below 2X line width although sometimes it does. I don't completely understand.
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