50g filament usage ESUN spool 1Kg refill coil
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[~50g filament usage] ESUN spool (1Kg refill coil)

Minimalistic Spool for ESUN 1KG refill coils with 6 tunnels for the end of the filament ...

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[~50g filament usage] ESUN spool (1Kg refill coil) alternatives
Refill Spool by SFLG
FabLab Gdańsk