Concept by Colin J. Roberts and Paul J. Roberts. Please see their website for more information and history: http://www.pjroberts.com/sphericon/index.php
Some have two positions. In the picture see the amusing paths that these objects (the ones without "Stop" in the filename) will roll along.
3D Modeled by Chris K. Palmer
Printed by Jeff Rutzky. See his model in action here: http://www.vimeo.com/16985828
I uploaded these with Paul's permission to commemorate the arrival of my Cupcake CNC!
The HexaSphericon was successfully printed on a CupCake CNC by Jeff Rutzky. He put 3mm rare earth magnets into it to allow for the two parts to be put together into all the possible positions. All the uploaded models have the small square holes like the rendering of the part with the bottom side up and visible shows to receive 3mm rare earth magnets.
The models with "Stop" in the file name will not have a continuous roll path like the ones in the rendering but instead will roll until hitting a stop flat spot. The rendering without paths shows some but not all of the other Sphericons with stops as well as the ones without stops.