Line Appears on Circular Layers

[Sandvar]

Hi everyone,
I’m using Bambu Studio with a Bambu Lab X1C, and I’ve noticed this issue in my prints (see photo): whenever the print reaches a circular layer with an opening, there’s always a visible line or seam that shows up at the same spot.

Does anyone know why this happens and what specific settings I can tweak in Bambu Studio to fix or reduce it?

I had already tried to wash and clean my plate and set, add 5-10 degree temperature for bed and add a brim to parts with 0 “Brim-Object Gap to avoid adhesion issues

Filament: PLa Matte

Any help would be really appreciated, thanks

[lkraus]

The opening is not causing the line, nor the circular shape. It is the large difference in layer time between the bottom and the thinner walls. Same problem discussed here: Why am I getting this seam?