Cardboard Spool Protector inside  Extrudr Filament  Solvespace
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Cardboard Spool Protector (inside) - Extrudr Filament - Solvespace

Protector is designed for carton spools of Extrudr Filament to avoid dust and debris from turning on inside spool holder models ...

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Cardboard Spool Protector (inside) - Extrudr Filament - Solvespace alternatives
Filament Spool Lip
lazyfrosch