LEGO Great Ball Contraption (GBC) Layout 2012.9

LEGO Great Ball Contraption (GBC) Layout 2012.9
  akiyuky
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Lego Great Ball Contraption (GBC) in my house.my own 17 modulestracking the blue and red balls.running at  ...  balls/sec500 ballssize :  ... × ... path length : 31mconstruction time : 600 hoursmy blog  ... 1. ball

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