54mm Reel hub

This is out of date now, have a look at http://www.thingiverse.com/thing:1231973
A hub to fit a reel of filament that has a 54mm center hole, The front side has a recess for a "608" bearing. I have made the hole for the 8mm rod 13.5mm diameter so that the internal rotating part of the bearing isn't rubbing on the printed part. The hub is intended to be a tight fit so I have included some slots to allow a screwdriver to be used to pry the hub off of the reel. I looked at http://www.thingiver