1mm walls with a 0.4mm nozzle doesn’t divide equally. If you look at the preview and select “line type” as the view style, it will color the lines according to skin, wall, infill, etc.
Do the lines in those areas show the gaps you are seeing in your prints? If so, either modeling them as an integer multiple of nozzle width, 0.8 or 1.2, or decreasing the line width until the gap shows a line will help. Another option to maybe try first is the “print thin walls” option (you may need to search for the option.
if it looks like there’s no corresponding gap in the lines, then it may just be underextrusion. You can adjust the “flow rate”. This is a percentage where you can increase (numbers above 100] or decrease the flow rate.
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WulfC 0
On examining Cura's Preview, \I believe the issue arises when Inner Wall layers are visible on the outer surface.
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