USS Drybox Sleeve Bearing
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These bearing sleeves center your spools to fix massive friction issues with 3rd-party spools in the Prusa USS Drybox
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- Printables
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- Prusa Parts & Upgrades
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- Creative Commons — Attribution
Like many of you, I was excited to get my hands on the new Prusa USS Dryboxes. They offer great vapor sealing and stackability, but they have a massive flaw: they only really work well with Prusament. If you use 3rd-party filaments (like Jayo, Sunlu, Eryone, Extrudr, or Polymaker), you've probably noticed high resistance when the extruder pulls the filament. Because these spools don't sit perfectly centered on the USS axis, they ride along the bottom of the container. The friction is so intense that simply pulling the filament can drag an unmounted drybox right across the table. This puts a lot of unnecessary strain on your extruder gears.
see the discussion on reddit:
https://www.reddit.com/r/prusa3d/comments/1sjrpj7/psa_uss_drybox_only_truly_good_for_prusament_not/
I designed these custom bearing sleeves to fix the clearance issue. They slide over the central axis to perfectly center 3rd-party spools, lifting them just enough so they no longer scrape the bottom of the tupperware and glide suprisingly smooth even without any lubricant. This eliminates most of the drag and allows the spools to spin way more easily.
Important Note on Compatibility: Tolerances inside the USS Drybox are extremely tight. If an adapter is even a millimeter off in diameter, it won't work. Because spool inner diameters vary by manufacturer, there is no "one size fits all" fix.
I have created specifically sized sleeves that are stackable to cover several popular brands. You need to print and combine all the adapters until you reach the desired diameter
Currently compatible:
prusament 51,2mm (no sleeve)
extrudr 52,5 mm (sleeve 1)
overture 55 mm (combine sleeve 1 & 2)
Eryone 56 mm (combine sleeve 1, 2 & 3)
jayo,sunlu 72,6 mm (combine all sleeves)
Combine them from smallest to the biggest that fits the spool. I am still fine tuning the values. Feedback is welcome!
Print Settings:
Material: PLA or PETG (PETG preferred)
Layer Height: 0.2mm (doesn't matter)
Infill: 3-5%, Gyroid
Supports: None required
Seams: random (important!)
Note: While I love Prusa's philosophy and the materials they used for this drybox, making the container just 2-3mm larger in each direction would have avoided this issue entirely. Until they release a V2, these sleeves will save your extruder!