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Here is a k'nex ball machine that was built by a 7 year-old!
K'nex Ball Machine Lift: Giant Ball Catapultby Mechanical Master
Andromeda: K'nex ball machine preview 1by 15knexLaz
Knex Ball Machine Dangerousby Mechanical Master
Andromeda: K'nex Ball Machine Preview 2by 15knexLaz
K'nex ball machine Maximumby dickheijboer
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