i was tired of storing filament in bins and have yet to see a fully printable rack system only ones compatible with various rod so i did both, had a old broken hamper i took the rod from and made custom mounts so i could arrange it to hold 1kg spools, then designed solid and pipe rods and made the file a 3mf so all parts can be multiplied or scaled however you see fit for customizable shelves, rods are 150mm tall which is appropriate length to hold one spool when used to set width of the shelf system but i added brackets so that the shelves can be customized to however deep or tall you want, when printing rods for vertical use scale them up to either 200mm or 250mm for comfortable removal of the spools from the shelf, currently using home depot rods while printing what i need to make the racks accommodate my need for large quantity storage. everything has been tested and works great