Filament spool clamp

I have a few empty filament spools made of plastic and cardboard that are too good to throw away. Since I only buy filament refill packs without spools, I often need a way to store them once they've been opened. That's why I designed this clamp.

The existing filament rolls are cut open, the filament is slid onto the spool, and then secured with the clamp.

Printed with PLA, 0.2mm layer height, infill doesn't matter