Summary

Filament Hanger
There are too many people make filament holder for the outside spool, but it is much better for 3D printer to use filament inside the spool

1-https://www.youtube.com/watch?v=VDEjycUqF0U

2-https://www.youtube.com/watch?v=iJoVs-NLsPQ

3-ball bearings 608

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