One of the issues that has plagued ceramic 3D printing is the fact that the material tends to be heavy and dense. Researchers from the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS), the Wyss Institute for Biologically Inspired Engineering at Harvard University, and MIT have circumvented that issue by creating a ceramic foam that can be used to print lightweight structures with independently tunable macro- and micro-scale porosity. The material was inspired by the structure of grass, which is strong and robust despite its light weight. Read more at 3DPrint.com: https://3dprint.com/164218/3d-printable-ceramic-foam-ink/ ‎