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I decided to change this: http://www.instructables.com/id/Calculator-Contest-Patch-more-prices/
marble machine: Patch + more pricesby Mr. Muggle
K'nex Ball Machine Legacy Updateby Knex2thelimit
knex extra ball machine elementsby Mr. Muggle
The MAR Tankby Mr. Muggle
K'nex ball machine Maximumby dickheijboer
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