milling and drilling head
fr4 is most common, a copper clad heat resistant fiberglass board, and fr2, copper cladded phenolic paper. fr4 is easily available, but fr2 is considered better for this type of work because it is easier to machine. a dremel head to mill a pcb, (b) a hot end to 3d print stuff like any other reprap, (c) a solder paste dispensing head, etc.