We were looking at the servo driven marble maze projects over on instructables and thought we would try our own. We found nimaid's great maze generator here on Thingiverse and decided we could do the whole project with the 3D printer.
You can see how we built and programmed the maze over on our Instructable
You will need
1x maze_generator08 (or make your own by following nimaid's work)
Here is a short video https://youtu.be/0e0W5RPVfyM