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](https://a.co/d/4LQ39w9)