This is an extension for the 3uP Spool Holder (http://www.thingiverse.com/thing:591438) modified by drbogger from BPopilek's design. I was having problems with the blue spool jumping off because it was close to empty, so I designed this a-frame which helped. This design fits the 20mm version. I apologize for some of the sides being inside out, but it slices and prints without any problems. Also, I will not upload this to Thingiverse because I prefer not to support Stratasys (bullying smaller 3D printing companies) nor Makerbot (for stealing copyrighted designs).

Print 2 a-frames, and attach them to the outsides of the spool holders with longer bolts.

Attribution - Non-Commercial - Creative Commons

spool, holder, spoolholder, 3uP