Making PCB with 3D printer and permanent marker

Using permanent marker, a 3D printer and etching to create a PCB. I used FreePCB to create PCB layout and a gerber-file. I then used Flatcam to generate g-code for my K8200 3D-printer. A sharp metal rod is then removing the ink from the copper clad, and then it can be etched with ferric chloride. Tutorial: http://www.lamja.com/?p=635