Expandable Filament Rack

A fully 3d printable rack for holding spools of filament. All of the ones I found on here require materials other than 3d printed parts. This one requires only m3 bolts. One bar segment should hold 3 1kg spools of filament. Print another bar segment plus the bar coupler part and you can hold up to 6.
*edit* 3/7/18
Added bracing middle bracket and combined the mount/bracket pieces to reduce the number of screws required. The coupler should snap together with the bar pieces and glue should no lo