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I revised the Christmas Ornament RBS to have just a little more slope. I'm hoping it's enough to have the marble roll without problem. I added a few new things. This one has a circular base so that it should stand on its own. I also beefed up the frame to make it more durable. There's less rungs and a few more braces. I will have to print it and test it. If you just want one even though it hasn't been tested, please feel free to order but you're on your own. http://www.rollingballsculpture.net
You can see video of it here: http://www.youtube.com/watch?v=qUlLRtTp050