A team of researchers from a number of institutes in Moscow worked to explore the possibilities for 3D printing ceramic powder into replacement bone, as reported in their paper "3D printing of octacalcium phosphate bone substitutes," which appeared in the most recent issue of Frontiers in Bioengineering and Biotechnology. The experiment was conducted using a custom-designed 3D printer with a small bed that allowed them to try out a variety of materials and methods quickly and inexpensively. While their study showed that there were significant problems that developed with the particular prints that they had created, it did also demonstrate the positive potential for the use of 3D printing technology in the creation of replacement bone. Read more about the researchers' discoveries at 3DPrint.com: http://3dprint.com/68044/3d-printing-bone-research/
Below is an image from the paper: