Parametric slew bearing

Based on Matthew Sorensen gist of bearing, I've added some features, to make is a slew bearing (Picked up Idea from http://www.thingiverse.com/thing:321679)

This is a work in progress, you should better check out the scad than use customizer, at least for the moment.

This is a proof of concept for BQ Ciclop's bearing replacement.

08/11/2015 Update:
Minor update, parametric ball diameter

01/25/2015 Update:
Theres now a bunch other configurable parameters on customizer!