Well, depending on your definition of "DIY" and "make"... I have a Roland DXY-1100 from ~1990, an A3 flatbed design that is very precise. To make it go I had

Well, depending on your definition of "DIY" and "make"... I have a Roland DXY-1100 from ~1990, an A3 flatbed design that is very precise. To make it go I had to build a weird serial adaptor and a weirder two-voltage DC power supply, so I count it as DIY! Because old plotters like this were originally designed for commercial use (design, architecture, engineering, etc.) they're often very well designed and well made, so still good despite their age. Chiplotle (note the extra "l") is a handy Python library for controlling plotters like this. Unfortunately I managed to short out my power supply and fry one of the voltage converters, so I need to remake the power supply and make an actual case for it so I don't do that again! I also have a much bigger Roland plotter (not flatbed), but I haven't got that going yet.