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This is the smallest ball machine on instructables. It has no elements it just goes up and comes down. If you guys want I can post instructions.
Project S (Knex Ball Machine)by jollex
Project G (Knex Ball Machine)by jollex
Project N (Knex Ball Machine) - The Smallest and Most Pointless Ball Machine Everby jollex
K'nex Ball Machine Lift: Giant Ball Catapultby Mechanical Master
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