Water molecules in the air will strongly affect 3D printing filament, especially those with severe water absorption. The printing difficulty and printing results of nylon filament left in the air for one day will be extremely different compared to when they were just opened. Even if material like PLA or PLA+,  the content of water molecules in the filament will also increase after being left for half month.

Whether you are a 3D printing amateur or a pro, you defently have the filament that have been opened but not used up. Incorrect storage methods will directly cause these filaments lose their original properties. Eurus is able to help you deal with this situation in order to protect your filaments.