Cardboard spool core container storage system

Doublers can turn two cardboard rolls into a handy tall pencil cup for print tools, pens, scissors and co. Are you using Filament spools that come loaded onto 88mm cardboard spool cores like Bambu or SUNLU and don't know what to do with the cardboard core once you've used up the filament? Here's a way to reuse it and turn it into a helpful container/organizer box and reducing the amount of 3D printing related byproduct waste. Whether you'll use it to store filament clips, 3d printer tools, pens, fidgets, dice or whatever else needs storing or even as a convenient small trash bin for filament waste, we can always use neat small containers for something, and you get to save on filament to make a sturdy container since you get the sides from the cardboard roll for free. I designed a comprehensive library of parts to turn the cardboard cores into small containers, testing and comparing different combinations of edges on the outside and inside to strike the balance between holding strength