Low with custom Researchers at the University of Minnesota spent 3D printers printing an electronic circuit directly on a person\'s skin. For example, soldiers can now use this printed circuit to print a sensor on their hands that can alert them if they are using chemical or biological weapons. They can carry this miniature printing device and print it out on their own in a short period of time. Special ink uses silver sheet, unlike 3D printer ink that requires high temperature in the early days, it can be cured and carried out at room temperature. In addition, the device can be simply stripped off with tweezers or washed off with water. In addition to electronic products, low The cost printer can be used to heal skin wounds-the process was tested on mice.