“A Line-us Clone” (via). But this idea seems earlier, at least per a hackaday search (e.g. 2017, 2018 via, 2019 via). Basically, this is more or less a pantograph but automated, I think? Unfortunately, based on all the ones I see, it seems fundamentally limited to very squiggly lines. (I wonder why? Would need to read more.) But on the other hand, it seems super cheap! I really should try building one. A different plotter design (non-radial), with seemingly better quality, but somewhat bigger: www.thingiverse.com/thing:4796222