This is a Stand for Bowling-Balls to clean, move, turn around and so on.
It is made for Standard-Ballbearings (the ones with one large Ball and tiny other ones in a capsule).
Infill should be set to 20%.
One bearing on the Photo seems to be a little bit outside the Bearing-Hole, but it fits nearly perfect. (the guy who shot the photo was not very accurate while placing them into the holes ;) ). The prototype on the Photo was made with 0,15mm normal Mode with a modified JGAurora A5