Thingiverse

servo

 * http://www.thingiverse.com/thing:39688 Servo bracket
 * http://www.thingiverse.com/thing:41521/#files Cheap three axis CNC milling machine printed out of abs and http://www.thingiverse.com/thing:41594 aluminium version from same author.

bearings

 * http://www.instructables.com/id/DIY-printable-slew-bearing/?ALLSTEPS slew bearing. from https://www.marginallyclever.com/