Expandable Filament Rack
thingiverse
A fully 3D printable rack for holding spools of filament is what I needed, but all the ones I found here require materials other than 3D printed parts. This one requires only M3 bolts. One bar segment should hold three 1kg spools of filament. Print another bar segment plus the bar coupler part and you can hold up to six. *edit* 3/7/18 I 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 is no longer needed thanks to the middle bracing bracket.
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