Massive Hex Spool Shaft for Ender-2 (Hictop 3dp-21 )

This is simple M30 screw + nut (screw P=6mm) sets. But you'll fix Filament easily & rigidly.
You can use 2 type of Filament Spools by support part(Shaft_Adapter). Please find in attached Pics for Dimension reference.
Enjoy!