Spool End For Zen Toolworks Spools

A spool end for zen toolworks spools.
Large Diameter: 9.5 cm
Small Diameter: 7.2 cm

A 608 bearing is inserted into one side and the spool end it fits snuggly into the the spool.

Because the bearing is on the inner end of the spool end (on top when printing) no support is required.

I used the legs from mscourch's spool holder: http://www.thingiverse.com/thing:52927