These are interesting because as they roll, the center of mass remains a constant height above the table! This means they roll smoothly, and have no desired resting position (unless material is >2mm thick) From the excellent book "How Round Is Your Circle". Blog posts: wgprojects - perpendicular-rolling-ellipses [wgprojects - perpendicular-rolling-ellipses-2](http://wgprojects.blogspot.com/2014/07/perpendicular-rolling-ellipses-2.html ) Animation in OpenSCAD works quite well; much more obvious than when using Customizer. I wish Thingiverse supported gif animations - check out my blog to see some.To actually produce one, you'll need some kind of CNC machine and the ability to use OpenSCAD directly - Customizer won't be sufficient, since you have to get the thickness exact.