I have often seen designs of little hooks or clips to hold filament onto a spool. I thought I would take a shot at my own design for my Prusa i3 MK3. It holds any 1.75mm filament (may require sanding, but mine worked first try) and fits the metal frame.
I love printing. In my free time, I am almost always 3D printing something or designing. I use my Original Prusa i3 MK3S (with a semi-reliable MMU2S) to print all my models (well, all models after September 2018) and teach some kids at the local Elementary School. :)
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