I saw the Snowdonia 3D Printing’s Filament Spool Storage Rack and was immediately interested, as I had plenty of spools in 2 rectangular bins and a couple of 1in. dowels on hand. I redesigned the print so that it simply slides on. This allows it to be positioned wherever might be advantageous. The print, if tipped on its side requires no support and can be made wider or narrower as needed. I have printed these at a height of 20mm and 15mm; both work just fine using 10% infill and 3 perimeters. Its nice to be able quickly see the colors by storing them vertically.