Parametric bearing housing

This is a parametric design of a bearing house with pockets for hex nuts. The design is based off of a non-parametric design of a bearing housing of Instructable user [liquidhandwash](http://www.instructables.com/member/liquidhandwash/) that is a component of his [3D printed CNC mill](http://www.instructables.com/id/3D-printed-CNC-mill/).

The overall shape of the housing is a box determined by the parameters *Width* and *Height*. The cylindrical recess at the center of the box keeps the beari