Actually, your model is 1.5 walls thick, since walls are printed on all sides. The one outer wall is present on both outsides. 1.5 is not a whole number and there lies the problem. It will try to print 2 walls in some locations and reduce the difference using overlap compensation, or it will try to print one and fill in the gap using Fill Gaps Between Walls.
You'll have less rounding problems if you make your model 2.3mm wide or change your line width settings to 0.81mm.
We're working on preventing those rounding errors, but it is a lot more difficult than you might suspect. Hopefully we'll have a release in a couple of months or so which prevents the rounding error.
Your image didn't come through. Normally, in Windows you can just drag and drop an image from the Explorer into this editing box. Or copy and paste from image viewers like IrfanView, or from Windows Clipping Tool. Could you try that again?
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