Quality issue

Hello makers,

on a bambulab ps1 I have these imperfections … I have no idea what this is due to…

the printer has barely 20 hours of operation I use PLA-CF with steel nozzle and reinforced gear.
Overall, I’m very satisfied, but I think it can be fixed, don’t you?
thanks for your help!

printing in 0.12 / basic settings in Bambu studio

fig is 20 cm high / 9h30 printing time



Maybe nozzle temperature is to low

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solution with manual calibration of flow rate and K factor.
Printouts are now perfect

Hold your eyes open: you get the same look in picture if the nozzle clogged or the extruder works not properly