3D Printer shenanigans (Prusa MK3S) 

I've done it! Mwahaha! I mounted a Raspberry Pi4 to my Prusa via the Einsy Rambo J19 header.

No more stalls/dwells due to USB/RS232 bottlenecking!

Full writeup on Reddit, but basically the wiring is as such:

Pi GPIO bank -> Rambo J19
pin 8 (GPIO 14, UART TX) -> pin 6 (GPIO 19, RX1)
pin 10 (GPIO 15, UART RX) -> pin 8 (GPIO 18, TX1)
pin 9 (ground) -> pin 4 (ground)

The wires are twisted to reduce EMI.

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