Hmm I read about this in the Bambu wiki now. Seems like it could have been an under-extrusion linked to this. I’ll keep it in mind and fiddle with it next time I get similar behaviour and see if my current setting would have been near the max flow or not.
Kind makes sense because the first layer was nice but the second layer had the issues, and the first layer was printed much slower than the rest.





I’ll try the calibration cube you mention with the specific filament at high and low speed versus another filemant and try to compare the results…