Many polymers absorbs water from the air


After being dried some filaments like Nylon can reabsord the amount of moisture as before drying in less than 24 hours. This of course varies by circumstances, location and type of filament. For example, someone in the northern parts of the world might not have the same problems with filament absorbing moisture as someone in the southern hemisphere.

Nylon is a good example of a filament prone to absorb moisture from the air


Since the filament now contains water it will vaporise once extruded causing irregularities in the print.

The filament also swells which can result in feeding problems



Drying of filament.


Properly storing of filament