that't the next step - to print the 3 axis calibration model and adjust the printer with it.
it might also be from my model, but it looks more like a slight error on that axis - the other 3 walls are ok, the infil is stuck to the outer wall.
It might also be some infill calculation error (rounding, etc) - the infill does not touch the wall at all - i can insert a thing blade to the bottom on that spot.
I'll try making a small model that shows this - maybe someone can reproduce it
This is a problem with the attachment x or y attachments to the belt. If it is loose it will cause a backlash. I am experiencing this on some of my prints where it is soft on one side (because it is not attached). It will make the parts very weak.
<p>Same problem here, printing small box’s with wall thickness of .060" (1.5mm). All 4 sides had no infill.</p><p>Had to increase thickness to .070"(1.7mm) to get the infill.</p>
this is a workaround. If it is confirmed a mechanical error then you only compensate the loose with software settings. Usually try to get the mechanical parts work precise before compensation.