Gear Slew Bearing

A remix of the famous emmet's Gear Bearing (http://www.thingiverse.com/thing:53451), now with a circular inner part and mounting holes!

Acts as a replacement for the slew bearing (http://www.thingiverse.com/thing:885141) for my robot arm. The position of the mounting holes is identical.

Update
The original teeth are very small, and the distance between objects is too small, too. This causes fails when printing. An easy-to-print version is available (v2).