I have been printing with the Lulzbot natural ABS 3mm filament for better than a year on my Mini and been getting very satisfactory results with good PEI adhesion and no warping. I use the standard Cura parameters and have an enclosure that keeps the inside temperature just below 100F. Suddenly I can’t make a print stick to the PEI.
Last weekend I used some scraps of older filament with good results. Then I switched to a new roll of filament and nothing will stick. I just tried a second new roll of filament and no joy.
Is it possible I received bad filament?