Cable Spool Bottom for Customizer

This thing is just the customizer file for Bottom of the spool.
So please use this for customizing.

If you want to have a look at the whole thing please look here:
http://www.thingiverse.com/thing:1398088

You need to customize the bottom as well you can find it here:
http://www.thingiverse.com/thing:1405611
(please use the same parameters for inner and outer diameter).