Due to other project I currently make (QLBRD - https://hackaday.io/project/160671-qlbrd) I wanted to find a fast way for PCBs prototyping.I decided to engrave lacquer I covered boards with. Results surprised me as I expected total failure. This hack takes half an hour maximum to make.
Details are in the video in details below.
Prerequisites: 3d printer, some basic knowledge how it works and how not to break it, hard steel rod (can be repurposed precision screwdriver or a drill bit), some basic tools and optionally some electric ones, patience, precision.