Tiny filament spool for small printers (M8 rod axis)

I needed a small filament spool to put alongside with one of my little printers to keep things small and portable, so I made this thing. I kept the core at 50mm diameter to avoid filament break and also a 70mm length to store enough of it. It is still tiny enough and nice. The inner hole diameter is 9mm to be holded by a M8 rod. You will also need 6xM4 bolts & nuts to complete the setup. You'll also need 2x608zz bearings in case you use the bearing version. 608zz core version requires support fo