Hello, here is my 3rd, but largest, Magnetic Marble Lego Machine, nicknamed “The Popper” because of the noise it makes. I thought up, designed and built it in about three weeks in July 2012.

Here are two videos. The first explains the machine too, the second, just shows the machine working on its own.

This machine is Zappo approved! (Zappo is a cat we are house sitting.)