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Note: current/later versions of Grbl are hosted under a different GitHub organization:

If you’re interested in this, I recommend checking out: https://github.com/grblHAL

It’s a rewrite/fork of GRBL for ARM microcontrollers with a bunch of useful improvements.

I haven't tried that one, but I recommend GRBL-ESP32. I wonder what the day-to-day functional differences in these two firmwares are.

I really appreciate projects like this.

Grbl – open-source, high performance g-code-parser and CNC milling controller