4D: There has been so much on this topic lately. Here are a few in a group of a few first 4D printing research projects, using shape memory materials. There are many more, but all originate from these below. There are essentially 2 sources, the original ones to label "4D", MIT and 10 months later, University of Colorado.
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The following's original post can be found here in 'Product Design and Development':
4D Printing Technology for Composite Materials
Tue, 10/22/2013 - 1:48pm
The following's original post can be found here in 'Design News':
Materials & Assembly