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?
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Depends on the relative humidity in your house and the type of filament you use. I have usually ~30% humidity in my flat.
- PLA reall doesn’t care about humidity. I’ve got some 5yo rolls that still print like new, without storing them air-tight.
- PETG is fussier. After a few days they start to act up. I always have them in the filament dryer while printing.
- Specialist filaments (e.g. Nylon, Carbon, Wood) might be much more hydroscopic, depending on the material.
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