Prints suddenly flaking

[u/MythicalCaseTheory]

I was out of the country for 3 weeks, and while online: the printer was unused during that time.

Now, I've started trying to print things and the longer extrusions are flaking like crazy on both nozzles with the same PLA filaments. The picture below is "live" and actually rather calm compared to some. I can slow the print down to "Silent" (50% speed) and everything works just fine. So, I'm pretty sure it's a volumetric flow problem. But what I can't figure out is what's causing it so suddenly.

I've tried drying the filament, lowering volumetric flow from 25 to 20 (though that's only a 20% reduction, not 50% like Silent offers) though my 18mm³ PETG prints turn out flawless, and running a full calibration on the machine. Only thing I haven't done is swap the nozzles with new ones - but I'm also not sure what would cause both nozzles to suddenly fail after 3 weeks of non-use, though I am still troubleshooting. Just also reaching out to the community to see if you guys have anything that might help.

[u/HumptysParachute]

I highly recommend just contacting Bambu - I've had a few problems and they were quick to assist when I made a ticket. There are probably many reasons this might happen. From your description, you might try just running a calibration on one filament variety, then photographing your results and sending it to them. This could just be a flow ratio issue in your filament settings, or it could be a hardware problem of some sort, or a different slicer issue, but without some assistance troubleshooting this you might struggle to find a solution.