This is a dowel / rod that was made to fit perfectly with Tauron's Filament Rack. It fits 3 spools exactly, so it's great for small spaces if you don't have a ton of spools. 

My .3mf file is perfectly sturdy with 3 walls and 30% cubic infill. That's all you need. I thought you'd need to print this out of PETG, but I printed some out of PLA and they work great. 

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