Print quality bad in H2S?

Hi everyone,

I’ve been using my H2S printer for a few months now with no major issues, but I’ve hit a wall with a specific file. I’m seeing what looks like “scars” or inconsistent layer lines appearing in a very specific zone on the object (see attached photos).

Interestingly, some prints of this same file show it more prominently than others, but it always happens in the same area.

Printer: H2S
Filament: Bambulab PLA basic
Standard Speed and 0.16 Layer

I’m trying to figure out if this is a hardware issue or a slicer setting issue

Has anyone else encountered this on the H2S? Would love to know if I should be looking at mechanical maintenance or if I need to tweak my slicer settings.

Thanks in advance!

Edit!

I haved cut the model to print only the problem area at a different Z-height on the bed, and the scar appeared in the exact same spot on the model.

Also sometimes the model’s interior shows significant sagging/loose loops (Not every print some have some don’t)