This is my idea to reuse some of my old spools. designed it to fit the standard 2oz(59ml) folkArt style paint bottles that I've seemed to amass by the dozens. Pair this with my Lazy Susan project to give it even more versatility. See the link below for that model. Fits a standard 200mm wide spool. you may need to scale accordingly if you have an odd size spool. Each tier you create will accommodate 9 paint bottles.
https://www.printables.com/model/1172506-lazy-susan-uses-only-air-soft-bbs-for-bearings-and
The author marked this model as their own original creation.