Multiple wall filament holder

I designed this filament spool holder with modularity in mind, a single module can hold up to 3 1kg spools.In the example there are 4 modules in 2 staks but if you need more modules you can easily connect them like i did, also instead of vertical and horizontal rod you can use a 14mm wood rod(using the wood junctins in the file) as I did for a better aesthetics.Junctions between staks and the floor are optional if you don't like it but I recommend them for more rigidity. If you dont like the dra