Could build a crossed gantry printer https://hackaday.com/2020/08/19/re-imagining-the-crossed-gantry-3d-printer/ Toolchanging between plastic extruder and milling tool for high surface precision with FDM printing https://hackaday.com/2020/08/18/e3d-teaches-additive-machines-how-to-subtract/ Using a sharpie marker to make support removal much easier https://hackaday.com/2020/05/27/improving-3d-printed-supports-with-a-marker/This person automated it but pause commands inserted in the right place would make it possible to scribble on top of the support then resume.
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