If this guy ever decides to sell these, or make the plans available, he’ll have people beating a path to his door! This man built a machine that will shoot a tennis ball a few feet, which his dog would go fetch, and bring back to the machine so it could reload. Lather, rinse, repeat, happy dog! Even better when his son joins in the fun, happiness all around, thanks to awesome techno-geekery!
Enjoy!