Adapter for larger spools on Ruperts Horizontal Spool Holder

The Horizontal Spool Holder by Rupert - http://www.thingiverse.com/thing:12310 - is brilliantly simple and a quick print when you need something to hold your spools in a hurry without it taking up too much space when not in use. I keep a few of them handy for new printer owners, knowing the frustration of having to improvise something to hold your first roll of filament before you can get started.

This thing is an adapter for using larger spools on the horizontal holder. I designed this bec