Book Shelf Spool holder

Made a small shelf for a few books that also will hold 3 spools underneath it. I made the arms have 4 mounting screw holes however I don't think you need 4 screws per arm I just did 2 of them and its holding fine with just drywall screws. My spools are empty I don't know how strong it would be with full spools. Hopefully this can be a space saver for someone like it was for myself. I printed with basic PLA from Bambu at 25% strength and 3 walls. Enjoy