The Prusa USS Drybox is designed to keep filament in a low-humidity environment during printing. It is designed to slow moisture absorption by the inserted filament spool

The Prusa USS Drybox uses silica gel to maintain low internal humidity and you can monitor the humidity level using the built-in digital hygrometer or an optional indicator card (purchased separately).

Compatible filament spools

Prusament spools are fully compatible with the Prusa USS Drybox out of the box. This includes both the new spool design featuring the Open Print Tag and the older design without it.

Buddy3D spools are also fully compatible and require no adjustments.

Spools from third-party manufacturers (such as Polymaker, Elegoo, Sunlu, Hatchbox, Fillamentum, and others) may require adapters, especially cardboard spools. For these cases, Prusa recommends the printable parametric spool adapters created by community member Dave G., available on Printables.