I started noticing them about a month or so ago, its just along near the walls. I just use the bambu basic settings I haven’t got into much more of the settings. im using bambu basic filament and have experimented with other filaments. I have been keeping the printer maintained and have used different hot ends to help, but didn’t help much. I think it is a flow issue but have already run a flow calibration test. these are mostly small prints like coasters,multi color that I notice it. maybe an .02 nozzle would be better. They almost look like stitch lines along the wall of the print.