Clip on spool holder Mendelmax

I wanted to utilize my clips for a spool holder i added a backing bar to engage the rail at 90 degrees its very solid, can be removed with some force with out destroying it. i have only printed it in ABS.
UPDATE 1/19/13: Added a filament Guide i had problems with my super thin 1 lbs spool getting knocked off the bearings i hope this helps!