Filament clip
thingiverse
Store your filament on cardboard spools by using a simple clip that slips into the edge of the spool and has a hole to hold your filament in place. This clip is suitable for stationary filaments but may require additional measures if you plan to ship it. Adjust the "clipgap" parameter according to your spool thickness, choosing from available STL files (2mm, 4mm, 5mm) or editing the OpenSCAD model. To use the clip, place a loose filament end into the beveled hole, tighten it on the spool if necessary, and slip the clip onto the spool edge for secure filament storage.
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