3D printers already have a firm footing the commercial market, with more than 20 models available for well-heeled DIYers, and the technology's appeal isn't lost on the scientific community. A team at Heriot-Watt University in Edinburgh, Scotland has developed a method for 3D-printing clusters of human embryonic stem cells in a variety of sizes. Researchers have successfully printed 3D cells before, but this is the first time that embryonic cell cultures, which are especially delicate, have been built in three dimensions. Human embryonic stem cells can replicate almost any type of tissue in the human body --
