This is a very nice Toy, I have seen it made out of wood for some hundred Euro. You can turn the internal balls but you cant remove them. I hope that it is printable. As I don't have a 3D printer so far, I can't test. Please give me your feedback.
19.3.13 I got feedback about my script and will update it
22.03.2013 I updated the script and added 2 more balls.Ball in a Ball in a Ball - by Flightcache
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16.002 w x
16.002 d x
6.3 w x
6.3 d x