I have watch the videos and preformed the exercises however I cannot find how to create a ring with a channel with stones of different sizes. A variable stone size channel would be a nice feature if there is not one present. This is a really cool program and it makes easy designs even easier and something I can train my staff on very quickly and efficiently. This is just for 2shape cloud. I will look in 2Shapes for Rhino next to see if the feature is there.