Working on some examples of basic PCB things you can make with CircuitPainter- here's a command line perf board generator: https://github.com/Blinkinlabs/circuitpainter/blob/main/examples/perfboard.py
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Definitely don't use this to make perf boards with slightly incorrect spacings, and send them to your enemies ;-)
@cibomahto Could be useful for creating a perf board compatible with Soviet standard mm instead of inch spacing.