NeilB just 3Dprinted gosper.org/IMG_0348.JPG a more cubical and evil variant of http://www.spacecubes.com/ . The commercial version is known as a dexterity put-together. It isn't it a coordinated motion put-together, like http://gosper.org/IMG_0205.JPG , wherein all six pieces must converge in unison. But puzzle(!): can they *diverge* in unison? If so, what holds it together? Particulalry the slippery commercial one. --rwg Diverge in unison = spin apart, e.g., https://www.youtube.com/watch?v=pvT5ySMnO8U