New 4D prints transform into permanent shapes when heat is applied


New work out of Georgia Tech promises to lend a sense of permanence to shape-shifting 3D printing. The technology, commonly referred to as 4D printing by those in the know, aims to add another dimension to the 3D printing process by creating an object designed to change shape after it leaves the print bed. Most models from research institutes like Harvard and MIT have relied on hydrogels to execute the process. The soft materials execute the functionality slowly and dont retain their shape after the process is completed. Videos out of Georgia Techs team show a real-time transformation that takes around five seconds to complete, once the polymer object has come into contact with a heat source, like a blow drier or hot water.

Normally the time is pretty long, Georgia Tech professor H. Jerry Qi told TechCrunch. You have to wait hours for it to change shape. And also theyre very soft, because hydrogels are soft. Theyre typically softer than skin. With our new approach, the responsive time is very fast. The videos are real-time. The shape change happens almost instantly.

The videos highlight a number of different objects to show the diversity of the process, from a lattice work that unfolds to eight times its size, to a complex and colorful flower that appears to wilt when dipped in hot water. The researchers were also able to determine the objects final shape to some degree during the printing process.

The shape change is all controlled by printing parameters and how you arrange the print structures and the different materials in the structures, said Qi. Its an advance from what weve done before, because it simplifies the process significantly.

For now, the research is the stuff of cool lab videos and grant fodder, but in the future, such shape shifting objects could have potentially wide ranging device. Biomedical devicesare one that immediately spring to mind for the team, like implants that change shape ones they come into contact with body heat.

The permanence of the new structure post transformation could also broaden the products appeal in the consumer field

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