Leftover filament spool

For a while I had too many almost finished spools in my dryboxes holding a lot of space. To relive the storage issue I designed this modular spool where two identical side can be attached together, multiple spools can be attached into tandem. It also has edge protectors and an extender to 200mm diameter. This last one is handy when someone uses a double roller type stand which designed to roll 200 mm diameter spools , as I do. The edge helps the spool rolling if it is hanged thru it's hole at the core.

For the assembly of the spool 3 pcs of M3/16mm screws and nuts are needed.