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tumbler-a knex ball machine stands at 4 feet tall 2 lift systems and 4 paths.
Connected Arm Lift, Sandroknexmaster's knex lift.by knex dude 2000
Andromeda K'nex ball machineby 15knexLaz
project pointless- tiny knex ball machineby knexforever
knex ball machine "Crazy"by Sorunome
Titanium - A Knex Ball Machineby HamenChips
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