Like many 3D printing enthusiasts, I ended up with a growing collection of empty filament spools. Instead of letting them gather dust or throwing them away, I reused. The idea was simple: convert empty Numakers spools into a practical storage box. I couldn't find an STL designed specifically for the new Numakers spools. So I decided to design my own version from scratch. The result is a compact and functional storage box that reuses two empty spools and helps organize all those small items .