When wet filament hits the hot nozzle, the water inside instantly boils, expanding in volume. This creates steam bubbles that pop out of the nozzle, leading to stringing, oozing, and rough finish instead of smooth walls.
Most filament storage boxes are just repurposed food containers. Prusa built the Prusa USS Drybox from the ground up for 3D printing, made from special hydrophobic materials. It's a sealed storage container built around a simple idea: place your spool inside, print directly from the box, and leave it there until it’s empty.
The flat sides make the boxes fully stackable for neat organization. One box per spool: place it inside once, and leave it there until the roll is empty.
A clever central opening allows the box to mount directly onto your existing spool holder (the Prusa bayonet spoolholder). This way, Prusa also minimized the free internal space where humid air could accumulate.
The box is big enough to fit standard spools from just about any brand (up to 1kg), along with smaller specialty rolls.
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