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 just got a cheap food dehydrator and stop thinking about it. I just print as needed, mostly functional stuff, or just enclosure for my electronic projects. 1 kg lasted me months, I’m still on the same kg that I bought early this year. And I’m in SEA, we have like 90+% humidity here.