I’ve printed about 40 rolls of iiidmax PLA+ and have encountered bulges like these before. I thought it was just bad luck but I think I’m done now. Going to try to finish the 10 rolls I still have left and find a new brand.
It’s the cheapest PLA that I could find at about $10 / roll, made in the USA, ships pretty quickly, and nearly all rolls print without issue. But this is the second time I’ve seen a bulge like this, so it’s not bad luck. There’s some quality control issues.