Galton Board demo

A few notes:

Yes, I know, this is not enough to be statistically accurate. I wanted to make one with 10 or more slots at the bottom so it could actually show the curve well, but my 3d printer size did not allow me. I may make another version later in a way that lets it happen. 

It tends to throw the balls too far to the left and right, but that is okay. Treat those as statistical outliers ;) 

Outside of that, I think it works well, so have fun and let me know how close to the std deviation you can get!