Hard Drive Universal Filament Roller

Inspired by CreativeTools' Universal stand-alone filament spool holder
http://www.thingiverse.com/thing:508896

Made a universal roller using ball bearings before but not satisfied, so decided to stick with my scrap hard drive as a roller. After using a roll of tape to support the spool, I made this to better centralize the spool on the disc (not perfect but I'm happy with it).

I made the base and the rod so tight so I didn't need to use glue to stick them together, but because of that I