Circuit printers and 3D printers are relatively accessible these days. Rabbit Proto, an open source project based out of Stanford University, wants to make it a little bit simpler to put the two together with a set of kits it is offering that make it easier to print 3D objects that are electronics compatible from the start. Rabbit Proto’s team has created a syringe-like extruder that prints conductive ink, which can serve as circuits that connect different parts of an electronic device.