Filament spool

I made a filament spool, size is about the same you'd get Creality filament on. It should take you about 4 hrs with 1 mm extruder. I made it with both PLA and ABS, worked out fine, just need to change the temperature. You will need to hot glue female+male parts together.

Feel free to adjust the CAD for your needs, to make female just disable one of the extrusions...