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?
I used to just open store, but I live in a desert. I now store and print from cheap cereal container diy dry boxes with desiccant. Prints have gotten much better for me. I almost always print PETG