FYI, Grbl has been ported to a Teensy and other ARM boards by various users but they are not up-to-date with the main repo nor will they give you much more performance since the Arduino Uno’s Avr does fine (I’m the lead developer of Grbl). You’ll only get extra flash and ram to install your own peripherals, and a higher max step frequency. That’s about it.
FWIW, I’m working on a next-gen Grbl on a 32-bit ARM that will take advantage of the extra power. Its a total overhaul of the system and will include a lot more functionality. I’m still going to make sure to pack in as much as I can into Grbl on the Arduino Uno though so that everyone can CNC with a good powerful compact firmware.
Thank you for the info. I’m sure everyone will appreciate the work on either option.
Any updates on a new 32 Bit Grbl Platform?