ExpandFab is a method of creating objects that expand and become massive when heated. With this method, objects in the shape of living things are subjected to high temperatures that cause them to wiggle and change shape as if they were alive.

This expression is made possible by two materials: a powder called a thermally expansive microcapsule and an elastic adhesive that acts as a medium to hold the powder together. By mixing these two materials together, it is possible to create an extended deformation of the object after it has been processed by 3D printing.

This project adds a new parameter of size expansion to the realm of 4D printing, which will contribute to its practicality and expressiveness. For example, it is possible to create objects that expand at any given time through thermal expansion. Creating and transporting small volumes helps to reduce transportation costs. Also, by applying materials with different expansion rates locally, it is possible to program not only an isometric change but also a change to a different shape from the previous one.

We believe that this technology opens up a field of application for objects that can adaptively change their shape and size according to their needs.

開元宏樹 (Hiroki Kaimoto)
山岡潤一 (Junichi Yamaoka)
中丸啓 (Satoshi Nakamaru)
川原圭博(Yoshihiro Kawahara)
筧康明 (Yasuaki Kakehi)