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Prusa Research · authorised UK reseller

Prusa USS Drybox

drybox spool holders1 / 11

Prusa USS Drybox

1 / 11

£39.59inc. VAT

SKU PRUSA-3940-0

Order before 3pm for same-day processing. Tracked delivery, [CONFIRM TYPICAL DELIVERY WINDOW] to your door.

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1

95% less moisture absorption

vs. ambient air

5× more airtight

vs. generic dryboxes, on par with Museum-Grade Sealing

50% better sealing

vs. generic dryboxes

Stable for weeks

10% Relative humidity when using 50g silica gel

A closer look

Prusa USS Drybox · Product information from Prusa Research.

Explore product details (3)

Wet filament = ruined prints

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.

Never deal with wet filament again.

Most filament storage boxes are just repurposed food containers. We 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.

Close up of the sealed filament output slot

Unique quick access port

Access and load your filament without opening the lid. The sealed port keeps moisture out while you print, and it fits a PTFE tube perfectly for direct connection.

Drybox mounted on a standard 3D printer spool holder

Universal Mounting

A clever central opening allows the box to mount directly onto your existing spool holder (the Prusa bayonet spoolholder). This way, we also minimized the free internal space where humid air could accumulate.

Multiple dryboxes stacked vertically

Stackable Design

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.

Fits the vast majority of spools

We made the box big enough to fit standard spools from just about any brand (up to 1kg), along with smaller specialty rolls.

Moisture Absorption Over Time

Meassured with Prusament PCCF filament, without any silica gel in the box.

Useful features

of the Prusa USS Drybox

  • Integrated Sensor

    Always know the exact conditions inside. Built-in hygrometer and thermometer for easy monitoring (°C/°F).

  • Label Holder

    Identify your materials easily with included tear-off labels or 3D print your own custom tags, using a template from Printables.com.

  • Smart Side Access

    Small side covers let you manually rotate the spool or replace silica gel without opening the whole box.

Common Questions

Which spoolholders are supported?

The Prusa USS Drybox fits perfectly on the bayonet style spoolholder found on the Prusa CORE One+ and CORE One L. For CORE One, XL, MK4/S/+ and HT90, we provide printable adapters (soon on Printables).

Can I print directly from it?

Yes. The sealed PTFE exit port allows your printer to pull filament with low friction while keeping the internal environment airtight.

Does it come with desiccant?

Yes, It includes 50g of silica gel, which maintains 10% relative humidity (RH) for weeks at a time.

Will this work with my non-Prusa printer?

You can feed filament directly from the box to any 3D printer. Attaching the drybox on the printer will work with compatible spoolholders, such as those on Prusa 3D printers (spoolholder with bayonet lock system), or any community made spoolholders for other printers.

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