zemlin...I discovered that my problem was caused by the phenomenon you described.
I had 2.4 mm walls on a box (70x100x20 & no supports) that when the roof (bridge) was printed, it actually pulled the walls in when the bridge strands cooled and shrunk.
so it looks like a layer shift but actually isn't....the walls are pulled in from 90 deg to something like 85 or so...then the top solid layers on top of the bridge continue to print where they are supposed to but the wall has moved...giving the illusion of a layer shift.
the fix, I think, is going to redesign the print or modify the bridge printing parameters, ie speed, cooling, etc.
walls = 2.4mm
nozzle = .6
extrusion width = .65
layer height = .3
PLA @ 220c
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