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 modules tracking the blue and red balls. running at  ...  balls/sec 500 balls size :  ... × ...  path length : 31m construction time : 600 hours my blog  ...  1. ball

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