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I just finished constructing this 100,000 piece K'nex machine for a local children's museum, the largest of its kind ever made. : r/pics
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K'nex Education - Stem Explorations: Roller Coaster Building Set
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K'NEX Atomic Coaster Building Set Ages 9 for sale online | eBay
ATOMIC COASTER
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Best Buy: K'NEX Atomic Coaster Building Set 51441
