Zits/blobs

Bambu Lab H2 Series Bambu Lab H2D
1

1000011925
10000119251920×2560 267 KB

1000011902
10000119021920×2560 165 KB

I have printed this object MANY times with zero issues (see first image), then out of the blue I started getting zits/blobs on the side.

Im curious if the default retraction length of 0.4mm was recently changed in the recent software updates? I am going to up it to 0.6mm or 0.8mm. It seems that generic PLA is set to 0.8mm while bambu PLA is set to 0.4mm. Not sure why this is the case.

generic pla settings
generic pla settings664×521 52.7 KB

bambu pla settings
bambu pla settings653×467 49.6 KB

Yes the filament is dry (dried for 12hrs on AMS and again on a esun filament drier) same zits/blobs. I want the seam position to be random.

I swapped the nozzle with a new one in case that was the issue. I’ll let everyone know if that does anything. Anyone else have this random issue come up?

2

last time i saw that it was either wrong PA, or bubbles in filament.

3

What is PAs and can i alter that setting?

4

Just curious but could it be that you are at the end of the spool? I have had similar looking defects occur while using filaments that had previously worked just fine, but were then towards the end of the spool.