Prusa-Top Spool Mount

Inspired by the MendelMax spool mount, this one is designed to snap onto the threaded rods of a prusa mendel. Parametric script provided for use with FreeCAD. Otherwise for standard prusa, the given STL file should work.

I recommend re-using spools with my Ultimachine Split-Spool Hack: http://www.thingiverse.com/thing:16758