3-D Bacterial Printing Cycle (image) University of Texas at Austin Caption The bacteria are put in the solution, and when the solution cools, the bacteria become fixed in place. The researchers then identify which bacteria they want to cage and in what shape and fire the laser, using a chip adapted from a digital movie projector to project a two-dimensional image into the gelatin. Wherever it focuses, a solid matrix forms. Credit Courtesy of Jason Shear Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.