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We had in the beginning the same problem while trying to use the PLA, we thought that could be the filament. But as the other guy said, we started to try printing with the door open, the fan at full power, and we changed the printing surface for a square of glass (3mm). In order to fix the printing, in Brazil, there is a hair spray called “Karina - Fixação Extra Forte” (Karina - Extra Strong Fixation). Also, we quit printing PLA after using ABS, because of the overheating of the nozzle.

By the time we start using this process, our problems with PLA reduced a lot!