4D-printed robot self-assembles into a tube and rolls up hills

A 3D-printed material rolls itself up into a tube, becoming a  “4D-printed” robot that travels up hills when exposed to heat

4D-printed robot self-assembles into a tube and rolls up hills
A 3D-printed material rolls itself up into a tube, becoming a  “4D-printed” robot that travels up hills when exposed to heat