Use this 3D printed Funkiments spool core together with a pair of spool sides to create your reusable filament spool holder. Alternatively, download the design for the spool core here to print yourself and use in conjunction with the spool sides.
Hardboard Spool Core
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Funkiments designed core system to be used together with the reusable sides. Download the printable files here if you wish to 3D print your own core.