A Turret i designed in Solidworks and printed with PLA with a .4mm and .25mm layer height.
I had to file the tilt mount a bit because the servo did not quite fit through the cutout. As well I had to file the Towerpro servo mounting flanges a bit to fit through the bottom of the main mount, My Model was a bit out. Otherwise it went together quite well.
I have included Solidworks files in case some body would like to mod the parts to fit better. Some parts will need support.
The bearing is 11mm o/d, 4mm i/d and 4mm wide. Enjoy!