Simplified Caged Ball Bearing

Disclaimer:
Due to the recent incidents (things appearing on ebay) I just want to make something very clear:
I do not allow any commercial use of my STL-files, my designs and my photos!

Description:
Oh no, not again another ball bearing...

Sorry, but I just have to show my final design. jonathanw's comment on my last ball bearing ( http://www.thingiverse.com/thing:57762 ) gave me new ideas. I reduced the bearing to three parts. The inner ring is now made of one piece and need not to b