Designed to clamp onto a wire shelving rack this clamp is designed to print the same model twice to clamp onto the wire rack shelving unit.  To effectively use this system, print 4 of the clamp (2 for each side of the support) and insert the 6.35 mm (¼ in) metal tubing or rods and set your filament spools on the rods.  If you're using long rods you can also print the support bar.  To effectively use this support bar there needs to be a shelf of some sort above the spool storage and feed the wire through the above shelf and the two wire locks to support added weight.