The humidity is regulated by large desiccant bags. The PolyBox can hold two 1kg spools or one 3kg spool and is compatible with 1.75mm and 2.85mm filament. The bobbins are placed on supported rods and the filament is fed through one of the 6 output holes. This makes the PolyBox compatible with almost any printer setup. The desiccant of the drybox Edition 2 can be dried in the microwave to be reused.