Middle layer gap and some small "explosion" holes in print
I've recently got an MK4S and have had several successful prints in PLA, PETG, ASA and PC Blend.
However, PETG prints had always had a less smooth finish with some layer variation here and there (by that I mean a layer that sticks out very slightly or is very slightly more recessed) but nothing that I would call a failed print or even bad quality finish.
Yesterday I tried printing a larger model and a single layer in the middle has a gap and some strings sticking out. While the rest of the model looks mostly fine (perfect base layers, quite smooth finish overall), there are some small "exploded" holes here and there with material that looks like it was expelled from the hole.
What could the cause be? Any idea how to troubleshoot the issue?
This was printed with 0.20 mm layer height structural profile, with the stock profile for prusa PETG using a brand new spool.
