Horizontal Filament Holder

I wanted a replacement for the kit spool holder provided with my Anet A8. I found many different versions but I only had one skateboard bearing and I couldn't be bothered to wait for my new ones to arrive! So I decided to design a horizontal spool holder that not only uses 1 bearing but as an added plus is compatible with all sizes of Spool.

This is my first design so ANY feedback is welcome. If its something I can fix, I will! Cheers!