UP! / Afinia Filament Spool Holder
Description
Replacement Filament post for the UP! or Afinia 3D Printers. Designed to handle 700g filament spools from pp3dp and 1kg spools from Afinia, Octave and 3DD.
Instructions
This design requires 12 - 5/16" ball bearings placed into the spool holder for it to work. (I used 5/16" slingshot ammo since it was cheaper and available in local sporting goods stores)
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License
UP! / Afinia Filament Spool Holder by walter is licensed under the Attribution - Non-Commercial - Creative Commons license.

SWEET. Did you print 100% infill, or semisolid?
I don't recall what settings I used, but I don't think it needs dense infill. It will add some additional internal support ribs where it's needed, at least when printed on an Up.