Let me start by saying that I agree that desktop electronics manufacturing will be the &quot;next big thing&quot; in the maker movement, and I am a huge fan.<p>However, this article does not mention two very important issues.  In order to make a circuit board of any interesting complexity (i.e. more than an Arduino and a few LEDs), you need more than 2 copper layers to route your traces on.  And, you need VIAs (Vertical Interconnect Access), which are columns of copper that make electrical connections between the layers.<p>I have used a PCB mill and while it is very useful for making extremely simple circuits, it only lets you mill 2-layer boards, and it does not let you make VIAs (instead you have to manually drill a hole through the board and solder a pin into the hole, and this approach has a much much larger diameter than a real via).<p>In order to be interesting for &quot;maker&quot; goals such as Linux machines, IoT, and robotics, there needs to be a desktop fab solution that can <i>at the very least</i> make 4-layer boards, with VIAs.