3D-printers have opened endless possibilities for home production and rapid prototyping. You can easily create practically any model in a 3D-program and 3D print it. But until now, only a few people thought about the possibility to 3D print electronics for particular solutions (model).
Until recently, in order to make a circuit board for a prototype, you had to make it using a soldering iron, or order a short production run. However, many of us can make it using a conventional iron and a laser printer.