This is a filament holder as a addon attachment for a Elfa shelf system. This was inspired by http://www.thingiverse.com/thing:562761 with the diferense that i wanted to build it on a Elfa system. Going to use ziplock bags with silicabags in them to preserve the filaments from moisture.

You need a Elfa shelf system with atleast 2 x 270mm 10 1/2" shelf holders. 2 x M5 16 mm screws to fasten the addon attachment and 2 x 30 mm balaclava broom sticks or something simular. Other then that i used 25% infil and rest is fairly strait forward.