That could be cool. Personally have a special place in my heart for DB9 connectors having spent many years fiddling with Commodore 64 and Amigas.
Arduino (v0.2) and ESP32 (v0.3) version ended wire up like this, and just as messy IRL…
Was neat getting my initial JackPot (v0.1) prototype experiment running, was relatively fast to configure FluidNC. But JackPot’s overkill for this silly tool, so, I will loosely rationalize this project as an opportunity to try making a smaller slimmer pcb with 2-4 steppers, “SidePot” ?