Wooden Marble Run Kits
In 2011, Walter Mason built the world’s longest marble run out of wooden modular tracks. Now he’s raising funds on Kickstarter for smaller sets of his tracks. The Boa set works with ping pong balls (or similarly sized balls), while the Anaconda works with larger balls.
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Crowdfunded projects pose a degree of risk for buyers, so be sure to do your research before paying your hard-earned money.