Don’t let the green solder mask fool you. This is a homemade PCB. [Kurt Skauen] started with your standard artwork, followed by etching. He then applied a solder mask that is UV curable.

By cutting the solder mask layer into a business card with the laser cutter, it can be held on top of a PCB and then used as a stencil to add the solder paste more easily than could otherwise be done.