Prusa Launches a Filament Drybox With ‘Museum-Grade’ Sealing for Under $35
Available now, Prusa’s Universal Storage System (USS) drybox looks like a “Swiss Army” box for filament storage, allowing external switching of desiccant, direct printing, as well as a hygrometer and thermometer for condition monitoring.
First shown at Formnext 2025 and now available, some four months later than initially expected, Prusa’s self-developed drybox solution is finally here. Costing $34.99 from the Prusa webstore, the USS is a fully sealed, single-spool polypropylene box that offers what Prusa describes as “museum-grade” sealing for your filament. At the time of writing the lead-time has crept up to 3-4 weeks.
Prusa claims an Air Exchange Rate (AER) of 0.15, offering a 95% moisture reduction compared to no storage in the open air, and sealing five times tighter than “generic dryboxes”. According to the American Institute of Conservation’s 2020 standard, that puts the USS as “degree III” or “well sealed”, below “very well-sealed” and, of course, “hermetically sealed”. The AER figures and comparative claims are sourced entirely from Prusa’s own internal testing. They tested Prusament PCCF in a generic sealed box against the USS, both systems with no desiccant silica, with the USS tracking slightly more effective at limiting absorption over five days. It’s worth noting both systems kept the filament well below the company’s stated 0.12% water content – the point at which the printing quality degrades.
All of this is to say, any box is better than no box at keeping moisture-absorbing material in better printable condition for longer, though Prusa’s new solution is neatly designed to offer some advantages, particularly if you use their machines.
The design nods to Prusa’s current line up of printers, with a hole through the middle that allows for mounting directly onto the “bayonet” style spool holders introduced with the Core One L. The overall design is printer agnostic, though, with 3D printable adapters for Prusa’s older machines coming soon, the possibility for you to design your own for your own machine, or simply to use it as is on a desk alongside your printer. Most importantly spools from a variety of brands fit, with a short video on the product page showing Fiberlogy and Bambu Lab spools fitting inside the USS.
Two features let you interact with the box and filament without opening it up, meaning once you’ve put a spool in, it can stay there undisturbed until you’ve used it all up. A rubber grommet lets you pick up and store the filament end ready for use when needed, and a separate compartment lets you exchange desiccant, again, without fully opening up the box. A dedicated spot for labeling, and temperature and moisture level sensors give you a quick view on what’s inside the the conditions within. Handily, the design is stackable, keeping the overall footprint down and expanding your possibilities for using multiples in various storage or active use situations.
Overall, it seems a smart solution to common issues with dryboxes tailored for everyday use, one that’s nearly seven times cheaper than the Prusa Pro Drybox, the company’s hermetically sealed filament box that retails for $234.99. The Prusa USS is available now from the Prusa webstore.
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