Hi conny_g,
I am having very similar problems. I thought it was down to movements of the head in x-direction.
I keep printing new couplings to avoid the slight movement of the bottom magnets.
But since I read your findings I think I have something similar in addition:
First I calibrate properly using the well known xy scales for adjustment.
Then I print something and the surprise offset is more the .5mm out in both directions. That is right from the start.
Then I used some calibration model (four checkered square) in the center and calibrated from there.
That give me less offset in the printed model but still and again .3 to .5mm offset.
As I said I blamed my mechanical execution of the coupling print but the offset I find is more than the mechanical looseness I have at the bottom magnets.
I cannot offer a solution to you other than saying if there would be some software glitch it would also explain what I find.
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conny_g 251
Redid the extruder offset calibration and that was at max 0.05-0.1mm off, but probably just the remainder of the original calibration.
So that seems rather unchanged.
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