I cannot help but to play with the math of the rotary jig. Here is my mornings exercise. My original question was how to carve a chain on the rotary jig. I realized that there would be too much stuff missed inside, so, I gave up on the chain. (I have experimented before carving chains as four sided carves.) I continued to play with donuts and thought some of you might find it interesting to see more examples of how real 3D transforms to rotary jig 3D. I have included an mpc in case someone with a rotary jig wants to give it a try.