Prusa USS Drybox – Universal Dry Filament Box

Prusa USS Drybox (Universal Storage System) is a premium, airtight box for filament storage, designed specifically for moisture protection and convenient daily 3D printing operation. Thanks to the clever central hole, the box can be mounted directly onto a compatible spool holder, minimizing the free internal volume where moisture could accumulate.

The body of the box is made of hydrophobic polypropylene (PP), which has significantly lower water vapor permeability than common polycarbonate boxes. Combined with high-quality seals, a sealed filament outlet, and the option to insert silica gel (approx. 50 g), you get a reliable solution for long-term storage of sensitive materials (PA, PC, PVB, TPU, composites, etc.).

Main advantages and features

• Airtight filament drybox for safe and long-term storage of spools.
• Reduces moisture absorption by up to 95% thanks to a design with very low air exchange volume.
• Hydrophobic PP material – significantly less permeable to moisture than common plastics.
• Unique central hole allows direct mounting on a compatible spool holder and minimizes internal volume.
• Integrated hygrometer and thermometer – gives you a constant overview of the conditions inside the box.
• Quick-Access port in the rubber lid: allows feeding the filament out without opening the box.
• Sealed PTFE outlet for smooth filament feeding directly into the printer.
• Possibility of direct printing from the box – the filament remains protected throughout the entire printing process.
• Stackable design – easy organization of multiple spools, ideal for print farms and professional operations.
• Side service openings for easy silica gel replacement and spool handling.
• Compatible with most 1000g spools (standard diameter of common filaments).

Compatibility

• Direct mounting on the bayonet spool holder of selected Prusa printers (e.g., CORE One / CORE One+ – according to the manufacturer).
• Usable with other 3D printers if you have or create a compatible holder with bayonet mounting.
• For printers without this system, custom or community adapters / holders can be used.

Practical use

Prusa USS Drybox is ideal for:

• users printing with hygroscopic materials (nylon, PC, PETG, PVB, flexible filaments),
• professional workplaces and print farms where multiple spools need to be stored clearly and safely,
• home users who want to protect filament from moisture without complex solutions and constant re-drying.

Thanks to the possibility of direct printing from the box, you insert the spool inside, connect the filament to the printer, and leave it there until it is completely consumed. This reduces handling, the risk of tangling, and above all, material degradation due to moisture.

Technical parameters

Note: Exact dimensions and package weight are not specified by the manufacturer at the time of writing; they may vary according to the production series and accessories used. For detailed dimensional compatibility of specific spool holders, we recommend following the technical documentation of the printer manufacturer.

Why choose Prusa USS Drybox

• Original Prusa accessory – designed for the modern ecosystem of Prusa printers including CORE One/CORE One+.
• Top-tier sealing and build quality – less moisture, less stringing, bubbles, and surface defects on the print.
• Convenience in daily printing – insert the spool once and you don't have to remove it until it's consumed.
• Modular and scalable solution – multiple boxes can easily be stacked for organizing a larger amount of material.

Prusa USS Drybox is a great choice for anyone serious about 3D printing quality who doesn't want results ruined by moisture in the material.

Key features:

• Original Prusa airtight drybox for safe filament storage
• Reduces moisture absorption by up to 95% and significantly extends material life
• Hydrophobic polypropylene (PP) and very low air exchange volume (AER approx. 0.15)
• Integrated hygrometer and thermometer for monitoring humidity and temperature inside the box
• Quick-Access port and sealed PTFE outlet – filament feeding without opening the box
• Possibility of direct printing from the box, suitable for most 1000g filament spools
• Stackable design, ideal for print farms and organizing multiple materials
• Compatibility with bayonet spool holder of selected Prusa printers, usable with other printers via adapters