Cornerstone Research Group has been working with shape memory materials for over 15 years, and they are now introducing Essemplex, a shape memory filament that prints like a rigid plastic but can be stretched, manipulated and reformed after printing. The filament is currently in beta testing and is gathering funding through a Kickstarter campaign. Read more at 3DPrint.com: http://3dprint.com/112083/essemplex-shape-memory/