Get the ball rolling with the newest maker design toy: your own custom marble machine. I created a set of 3d printed parts that allow you to build the marble machine(s) of your dreams as big or small as you want. With crossovers, loops, switches, and curves its a bottle of Instant Roller Coaster E...
By: Jazzmyn
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from Instructables: exploring - technology - robots http://ift.tt/1Lgb04p
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