This very complex machine has one job — to flip a water bottle. Built entirely out of K'NEX, YouTuber Thibault Art has created something that gets the viral water bottle flipping challenge right.
An exemplary display of the latter is The Citadel. Over the course of three years, redditor [Shadowman39] pieced together this monstrous K’nex structure. With over 17 different paths(!), ...
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