About half the time recently when printing with PLA, I see that holes or loops have a line of filament running approximately through the middle which seems to be one of the inner perimeters having detached and contracted, but is still attached on both sides. Is it a temperature thing, an extrusion thing? I can’t find a pattern. Bed adhesion is great. Bambu H2C, mostly printing with Bambu Basic PLA.
it’s not being adhesive, trying a 5+ degrees might help. try setting drawing the outside parameters first.
It’s both first layers and higher. No pattern I can find. Bed adhesion is definitely fine, I haven’t had a single lifted corner since I started using the SuperTac plate.
the pattern is pretty wonky, your slicer isn’t doing you any favors. try a different top and bottom pattern if the other suggestions don’t do anything