Report as inappropriate

I haven’t thought of marking sheets of metal with this idea. This can indeed be very useful! I recently saw a YouTube video by Thomas Sanladerer which shows the method of making PCB’s with a pen as you describe https://www.youtube.com/watch?v=sL0LZFcNaow. This would be definitely cool to do with the tool change! One of my planned projects will actually be about making PCB’s but with a small die grinder. This way I can drill the holes too :)