Fig. 6.

Dual-shape change tubes. a Schematic of the basic anatomy of the coral polyp; the image was created based on encyclopedic depictions of the polyp.50 b, c CAD model and image of a 3D printed and photocured tube with cylindrical base and three fingers. d–g Optical snapshots of shape change of the tube at different temperatures. The tube was suspended over a part placed in a tank. When water was added to the tank, the tube shows uniaxial elongation and gripping of the part. Upon heating to 50 °C, the tube shortened and the fingers opened to release the part back to the bottom of the tank. Scale bars are 1 cm [159]