Overhead, 45 deg. spool holder for 3030 extrusion

This design utilizes http://www.thingiverse.com/thing:767317 (clip.stl and spool_holder.stl) as a supplementary structure. I chose to use an 8mm tool steel rod instead of a threaded rod, both will work.

I designed the part to be simple to print, albeit with some ugly geometry.

Print the Big_pulley.stl file twice, offset properly, will mount a standard 1kg spool at 45 deg to the extrusion. See printing instructions.