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This is a very easy modern marble run at an inexpensive price.  It is constructed on your closet door and uses magnet tape to hold PVC pipe to sheet metal so you may change it at any time.  To see more on how to make this, visit the step by step instructable at https://www.instructables.com/id/Affordable-Easy-Marble-Run/

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Bio: White House Maker Faire // 15 years old // CEO of Qtechknow, maker and electronics enthusiast, I teach Arduino classes, and put making into schools!
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