The best solution is a drybox; a sealed filament container, usually with some desiccant inside. But in a pinch, [Spacefan]’s quick and dirty $0 drybox solution is at least inspiring in terms of ...

The most common desiccant used for filament storage is silica gel ... the size and seal of the container, the ambient humidity, and the frequency of opening the container. There is no definitive ...

and the small-scale test with the RS1 showed that with a full filament spool in the box, humidity inside the container would only drop very gradually as more and more moisture replaced what was ...