According to Optomec, Aerosol Jet printing utilizes aerodynamic focusing to precisely deposit nanomaterials to produce fine feature circuitry and embedded components without the use of masks or patterns. The resulting functional electronics can have line widths and pattern features ranging from 10’s of microns to centimeters.

Read more at: http://www.3ders.org/articles/20130531-optomec-is-3d-printing-antennas.html
The combination of 3D printing and Materials Technology, particularly the ‘nanoscale’ materials or the materials we now understand at atomic scale, is changing the world more quickly than some see. It is not always obvious because in the end the devices are not that different than what came before, just better, smaller, longer lasting, stronger, etc. over a relatively short time it is amazing what small increments of change, multiplied by thousands of applications and dozens of iterations, can build up to.