I've had my Prusa i3MK3S+ for a couple of months now, and done 100+ prints, and other than a few issues with first layer adhesion (which are pretty much solved now), have been getting consistently good results. That is, until the day before yesterday. My last six or seven prints have either failed altogether (items that I have successfully printed previously have failed, seeming to collapse midway through printing), or completed with such poor quality as to be useless.
I haven't changed any of the slicer settings, and am using the same filament that was working three days ago (and has been stored in a low-humidity environment). Initially, the printer had not been moved, nor had anything changed in its immediate environment (temperature and humidity are the same, as best as I can measure them).
(the above part was printed successfully about a week before, using the same filament and the same slicer settings, however here it printed with gaps between infill and outline, and circles printed as ellipses)
(the calibration cat at https://www.thingiverse.com/thing:1545913 -- I have never printed this before, but it does clearly show the kind of problems I'm having)
I've performed regular maintenance tasks and recalibrated the printer, but this hasn't made a difference. I've reinstalled Prusa Slicer with default settings, which didn't help either. I did think that maybe it was an issue with tension on the y-axis belt, which does look a bit loose, however, according to the printer's diagnostics, the tension in both belts is fine.
Any help/suggestions/ideas would be much appreciated!
EDIT: I decided to ignore the diagnostic report from the printer, and re-tension the Y-axis belt, and that has substantially improved things, although it is far from fixed.
So that's resolved some of the issues. The remaining layer shift appears to be only happening parallel to the Y-axis (i.e. the layers seem to line up perfectly along the X). Have I managed to fix one problem and introduce another??