One of the main problems with 3-D printers is that they are s-l-o-w. Early models could print with only one material at a time, but newer 3-D printers allow for a wider array of printing media and for printing with more than one material at a time. Water offers a promising means by which to manipulate 4-D objects, since nature provides numerous working models of objects that change shape in response to moisture. Toss it in water, and watch its shape change. Rieland, Randy. "Forget the 3D Printer: 4D Printing Could Change Everything." Smithsonian Magazine.

Stromberg, Joseph. "Why Humidity Makes Your Hair Curl." Smithsonian Magazine. Campbell-Dollaghan, Kelsey. "Why Is the US Army Investing in 4D Printing?" Gizmodo. But a few of the sorts of people who bet on these kinds of things are betting on it, and why not? Just look how far 3-D printing has come in just a few decades. Multi-material 3-D printing helped provide the control researchers needed, but they also needed the right materials.

Enter 3-D printing. Although new approaches continue to emerge, traditionally, 3-D printing has entailed repeatedly laying down carefully defined layers of polymer on a print bed.

DelViscio, Jeff. "Incredible New 3D Printing Technique Looks Like Sci-Fi." Popular Mechanics. If you like to separate your materials by color, transparent storage containers are doubly useful. Patients in hospitals are usually placed on a ventilator because of various medical problems and depending on a condition, the ventilator can partially help with breathing or totally breathe for the patient.

We've already mentioned how fashion and furnishings can provide a fun, profitable way to introduce a novel technology, and given the fact that one size very clearly does not fit all, it's a sector ripe for such applications. A 2015 report by market research firm Marketsandmarkets projected that 4-D printing would constitute a $555.6 million sector annually by 2025. The report assumes that 4-D tech will see commercialization in the short term, but only moderate initial progress (the switchover carries a high initial cost).

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