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A parabolic filament spool holder/roller. Just set it and forget it. The parabolic design of the roller keeps the filament reel centered.
Requires 4 skateboard bearings (i.e., 608zz Double Shielded, 8x22x7), and snaps together.
I grew tired of trying to adjust my filament reel holder for different filament reel widths, so I made this to accommodate any size.
It snaps together, and may take a little mallet tapping. If I were to redesign it, I would tweak that to be a bit better, but it has worked well for me for now.
Link to bearings: https://a.co/d/4LQ39w9












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