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tumbler-a knex ball machine stands at 4 feet tall 2 lift systems and 4 paths.
K'nex Ball Machine Lift: Giant Ball Catapultby Mechanical Master
Andromeda: K'nex ball machine preview 1by 15knexLaz
Knex Ball Machine Dangerousby Mechanical Master
Connected Arm Lift, Sandroknexmaster's knex lift.by knex dude 2000
project pointless- tiny knex ball machineby knexforever
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