Prusa USS Drybox

[CONTINUOUS DRY PRINTING] Features a sealed PTFE-compatible port that lets you access and feed your filament directly into the printer without opening the lid. The airtight seal actively keeps moisture out during the entire printing process. [SMART MOUNT & REDUCED AIR VOLUME] Designed with a clever central opening that allows direct mounting onto compatible bayonet-style spool holders. This unique shape minimizes internal air space, preventing humid air from accumulating around your filament. [ULTRA-LOW HUMIDITY & DUAL MONITORING] Holds up to 50 g of silica gel to maintain under 10% Relative Humidity (RH) for weeks. Built-in real-time digital hygrometer and thermometer (°C/°F) offer instant environment tracking. [UNIVERSAL FIT & EASY SIDE ACCESS] Accommodates standard 1 kg spools from almost any brand as well as smaller specialty rolls. Convenient mini side covers allow you to manually turn the spool or refresh desiccant without unsealing the box. [EASY LABELING & STACKABLE DESIGN] Features flat sides for space-saving, stable stacking on your workbench. Includes an integrated label holder with printable/tear-off tags for neat material organization and quick identification.

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.