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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, using desiccant silica gel packets.
The Drybox is a transparent, sealable polypropylene container compatible with the Prusa printers (except MINI/+ and MMU). Its main advantages are simplicity, lightweight design, secure sealing, and the option to mount it directly onto the printer.
The drybox is made of the following parts:
| 1. Dessicant in an aluminium sealed pack | 8. Removable caps |
| 2. Material labels | 9. Outer seal (do not remove) |
| 3. PTFE tube | 10. Grommet (do not remove) |
| 4. O-ring for printed spoolholder | 11. Rib (do not remove) |
| 5. TPM40 hygrometer | 12. Inside seal (do not remove) |
| 6. Top | 13. Bottom |
| 7. O-ring seal for caps |
The Prusa USS Drybox uses silica gel to maintain low internal humidity. You can monitor the humidity level using the built-in digital hygrometer or an optional indicator card (purchased separately).
| Filament type | Maximum recommended RH (%) (measured on the hygrometer) |
|---|---|
| PLA | Below 30% RH (short-term tolerance up to 40%) |
| ABS | Below 30% RH (ideally below 15%) |
| ASA | Below 30% RH (ideally below 10%) |
| PETG | Below 20% RH |
| TPU | Below 20% RH (ideally <15%) |
| PVA | Below 20% RH |
| PC | Below 20% RH |
| BVOH | Below 20% RH |
To assemble the USS Drybox, follow the instructions in the dedicated article First setup and filament loading (USS Drybox).
When the filament is not in use, seal the filament guide using the included grommet.
Before starting, adjust the PTFE tube length to the size recommended for your printer.
To cut the PTFE tube, we recommend using any tool that slices cleanly. Avoid tools that crush, deform, or slip during cutting, such as scissors or cutting pliers, as they may deform the tube and increase filament friction. We recommend using a sharp box cutter or knife for a clean, straight cut.
If you are unable to make a straight cut manually, you can use a dedicated PTFE cutting guide available on Printables.com.
The Prusa USS Drybox should be mounted directly on the printer using dedicated holders available on Printables. These holders are specific to various printer models and utilize a puck-and-bayonet system for easy attachment.
Choose your printer for specific installation instructions:
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, we recommend the printable parametric spool adapters created by community member Dave G., available on Printables.