I have developed a second model for cutting thicker materials. It can definitely cut material that is 0.150in thick. It should be possible to cut up to 1/4in thick materials as well, but I have not tested that yet. Here are a couple of sample videos showing it in action.
http://youtu.be/P8jbtRTV6uw
http://youtu.be/bMoRUZnvbXw