3-D printed vaccine patch pioneered at UNC could revolutionize how we distribute vaccinations Posted Oct 4, 2021 New technology coming out of UNC could change everything about how vaccines are administered. Scientists at North Carolina and Stanford created a 3-D printed vaccine patch as small as the tip of your finger. The vaccine patch uses microneedles just long enough to attach to the skin. From there, the vaccine directly targets immune cells in the skin. (WTVD)