Personal scale PCB milling machines use one of two processes, a mechanical etching process, or a process in which conductive materials are sprayed onto a base board. The mechanical etching process on a desktop circuit maker involves a rotating milling bit that mechanically etches out the desired circuit design onto a copper circuit board. Both etching and spraying techniques enable users to create multi-layer and finely detailed PCBs. While small-scale circuit makers are relatively low cost and versatile, they are, like most other personal fabrication technologies, too slow for large batch production. As a.
