Most filaments absorb moisture from the air, especially PLA and PETG. The damp filament is likely to block the nozzle or ruin your prints. If the printing interval is long, store the filament in a vacuum-sealed bag with a desiccant, labeled with the unwrapped date.
- The exposed filament is supposed to use up within one month, and the vacuum-sealed filament can be stored for about 24 months.
- Store the filament at the temperature of around 25°C (77°F).
- Store the filament at the relative humidity of 40%.
- Avoid direct exposure to sunlight.
