Build a filament drier complete with a humidity meter with less than 5 dollars. This design allows you to dry your filament while you store it by inserting it into your spools hole. Materials used are linked in the description below.

Humidity Meter: https://amzn.to/3YsJzR3

Reusable Desiccant Beads: https://amzn.to/4iHQ2i3

3d Printer Filament (eSUN Matte Gray): https://amzn.to/3EQcebY

3d Printer (Kobra S1): https://amzn.to/43eYe4U