4D in the sense of objects that have ability to interact with themselves and the evironment closely around them. The are reacting in time.
4D printing is taking multi material properties 3D printing and adding transformation - so the individual pieces within the product move on their own.
Items are printed with the 3D printer: proteins. that will Self Assemble:
"Self assembly is a process by which disordered parts build an ordered structure through only local interaction."
Tibbits, S. (2013) The emergence of 4D Printing, available at: http://www.ted.com/talks/skylar_tibbits_the_emergence_of_4d_printing.html, viewed on: 30/09/2013.
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