PLA filament is a bio-plastic, it is susceptible to moisture. As the filament starts attracting moisture,
- That moisture can attract dirt and dust and spool it right into your print head
- The filament can expand and jam the head
- It can become brittle and broken like glass
So it is best idea keep the PLA filament as airtight as possible.
Thingiverse user and 3D printing enthusiast, Stephen Hall responded to this storage challenge by creating an airtight filament deliver system which is little more than a plastic storage bin (he used the Lock & Lock Handy Rectangular 12ltr container from Amazon), some 5mm push fit connectors, and some 3D printed holders he designed for the connectors. You can see more details about the build and download the printable holders on Stephen’s Thingiverse page.