Making PCB with 3D printer and permanent marker

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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: Источник видео youtube.com/watch?v=sNh0ubRcTYU