As you probably guessed, you have to cut the empty filament spool in half and fix it with this tool.

Print instructions

Category: 3D Printer Accessories Print Settings

Printer Brand: Creality

Printer: Ender 4

Rafts: No

Supports: No

Resolution: 0.3mm

Infill: 20%

Filament: theveel PETG Translucent