Marble machine 2.1 is a "new and improved" version of my old marble machine 2 that I build in 2000.
People often asked for plans for that machine, but the machine was totally cobbled together one piece at a time, so it wasn't the sort of thing I could draw plas for. So I designed and built a new and improved version of the machine in 2011. The design was modified so it would be easier to build from a set of plans
Why I built this machine
More about how the machine works
Watch all 12 construction videos in a row on YouTube
Reader built versions of this machine