Nano Dimension (TASE:NNDM,OTCQX:NNDMY) has created a 3D printer dedicated to printing multi-layer PCBs (printed circuit boards) called the Dragonfly 2020 that will benefit engineers and companies looking to rapidly test circuit board designs.
According to a video on CNET:

3D printing a circuit board gives you a couple of different advantages over the traditional method of sending it out to a manufacturing plant. The first one is that your intellectual property can stay safe and be produced in house. The second is the time it takes. Rather than a couple of weeks to get a prototype of a circuit board back for testing, this takes a couple of hours or even overnight.

Dragonfly 2020 uses a nano silver conductive ink and a proprietary dielectric ink for its printing. The product should be available on the market by the end of 2016. Meanwhile, pricing has yet to be disclosed.
Click here to view a video outlining its features on CNET.