Mirrored filament guide

When using dual extrusion system and you have a bowden stepper motor installed on the left side of the Z-axis support threaded rod and you want to use a filament guide, then this is the part that you can use. Read more about the dual filament spool holder system on this page: http://ezcontents.org/build-3d-printer-part-15-dual-filament-spool-holder