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Marblevator, Take the Stairs! - remix — image 1
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Marblevator, Take the Stairs! - remix

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Made some changes that work for me.

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I prefer heat set inserts to printed bolts and threads.  I modified all of the bolt connections to use M3 heatsets.  I also had problems with the balls dropping off the stairs.  I added extra material to the stairs and changed the stairs up to have more slope.  The original design will work for most people,but I think my printers have different tolerances than Greg's.

Video of it working