How long do you have filament sitting “in the open”? I mostly print with a single filament roll at a time, and just leave it on the printer. A 1kg roll lasts me several weeks. For long time storage I keep it in an air tight box with disiccant pouches.
But how long can I let it sit before I should start storing it with disiccant and/or drying the filament before use?
Best way to store them is go buy a cheap cooler and get some of those silica beads that you shouldn’t eat and toss them in the cooler with you filament should last a long time like this