Etching your own PCBs used to be a real chem lab exercise. First you had to copy the PCB layout from lm to the PCB material by exposing, developing and xing the photoresist. That involved a lot of chemicals, with unpleasant odors and a good chance of splashes or spills. Now there’s an entirely new option: the Voltera V-One can print circuit tracks, apply solder paste, and even solder the components in a re ow process.