So I recently bought a new spool of Bambu Lab PLA Basic blue (10601) and it was great… until it started giving me this issue: it is forming a lot of tiny dots, which look like small bubbles, all over the print surface. I would tend to exclude a humidity issue: I store this spool in the same exact way I do all the other ones I have (all Bambu Lab PLA Basic and Matte), all of which DO NOT give me this issue and print flawlessly. I also tried with different nozzle sizes (0.2 - 0.4 - 0.6), and with every one of them the filament behaves in the same exact way. So I have no clue what this is all about, and I really hope someone can help me.
Still looks like humidity. Might be a flow issue🤔
If not moisture and all similar rolls work fine…
Might just be a bad filament.
But usually bubbles are moisture related.
I had a roll from another brand that printed just like that. I emailed the brand and they shipped a replacement roll next day, no questions. The replacement printed perfectly.
You’re not gonna tell us what brand after they treated you that well? 
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This is most likely a humidity issue. I store all my spools together, but was getting humidity issues on some white PLA even though I bought 7 other spools in the same order.
@spinacello if you unspool a foot of the bad filament and examine it close up do you see any voids or inclusions? There has been some bad PETG-HF like that, but I haven’t heard of it in PLA Basic.
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no, the filament is perfectly fine. i will try to print another pbject to see if there are issues in the print settings
Hey there. I have the same issue with two black PLA basic spools that Bambu sent me after black friday event.
I order 4 spools in total - 2 were completely fine and 2 are bad. I dried them for over 12 hours (that’s what bambu support told me to do) but it even worsened the effect. I’m nearly sure that it has something to do with the filament quality. After black friday there was a ton of orders and a lot of delay - maybe they took some shortcut in production to cope with the amount of orders, I don’t know. No settings changed, dried a lot and it still persists. I made a support ticket and a complaint about it, we’ll see how they proceed with that.
How did you dry them, sounds like a moisture issue
Okay so I made a complaint to bambu about these 2 spools, they sent me new two spools that are perfect out of the box. Must’ve been something with these two unfortunately. Don’t waste your time for drying, TBH for me PLA should work out of the box. Who prints with PLA rathers expects it to be easy, not to require drying for multiple hours.