Very good tutorial. I've made a jillion 9 patch blocks, but mine never were as perfect as yours. I am going to follow your method the next time I make them. I especially like the idea of marking your ruler for the squaring up process. Thanks you for taking the time to show this to us. Someone commented it seemed to drag a bit, but with your "production set-up" I am not sure there is any way to avoid that. In the Missouri Star Quilt Company tutorials with their high end cameras, they do a lot of fading in and out so that after the first time, they can skip to the end of the next seam "magically". I really am impressed with what you can do with what I think is just your laptop camera.