This filament spool holder fits onto the Ultimaker2 and holds filament spools with a small diameter hole.More pictures and details here: http://www.eleccelerator.com/3dprint-drillbit-box-ultimaker-filament-spool-holder/
STEP and SolidWorks files are availableUPDATE: recommend instead https://youmagine.com/designs/f26-um2-bearing-spool-and-bearing-guide-upgrade
Combine with this solotion and you have the most simple best solution out there in my opinion. Easy to print, super smooth filament feeding.
http://www.thingiverse.com/thing:257366
JimboJones
about 10 years
Works great! I built a roller with bearings for the Bridge Nylon that fits this holder. (My roller has no holder of it's own)<br><a href="https://www.youmagine.com/designs/um2-bearing-filament-roller#!design-documents" rel="nofollow" target="_blank">https://www.youmagine.com/designs/um2-bearing-filament-roller#!design-documents</a><br><br>I really like this holder. Thanks!