Maybe this helps someone, maybe not, but I received a Duet 3 and decided not to go with a Raspberry Pi. I tried updating the firmware repeatedly with various methods (except the erase and start all over).

I could connect to the Duet 3 through a web browser and upload firmware, but the Duet 3 would crash and reset as soon as the upload finished. Same thing happened via USB and trying to run M997 S0 with the new firmware on the SD card.

This happened with both 3.01RC2 and stable 3.0.

Finally, before I went the erase route, I took a Raspberry Pi and installed the Duet3 Pi image. Uploaded new firmware and it updated correctly and everything seems fine. Not sure what the issue was with the Duet 3 but maybe if you have the same issue you can try this method - I don't think you even need to keep using the Raspberry Pi with the Duet 3 once firmware is up to date.

No Marlin but it does have GRBL:

GRBL Mill-router
GRBL Mill-router 2 axis

Has anyone used a Duet with SheetCam softare? They have several hundred gcode post processors, but none are Duets that I know of. I am hoping someone has a suggested post processor or the name of a machine that might process commands similarly to the Duet.

As an example one of the Machines TurboCNC v4 has these notes:

TurboCNC V4 post processor

Modal G-codes and coordinates
Uses G02/G03 for helical moves
No comments
Incremental IJ

If there isn't a machine that is similar maybe there are attributes I should be looking for that would be compatible with the Duet.

Am I understanding correctly that having 4 tool boards would allow up to 10 stepper motors to be controlled (6 from the Duet3 and 4 additional from the tool boards)?

Maybe this helps someone, maybe not, but I received a Duet 3 and decided not to go with a Raspberry Pi. I tried updating the firmware repeatedly with various methods (except the erase and start all over).

I could connect to the Duet 3 through a web browser and upload firmware, but the Duet 3 would crash and reset as soon as the upload finished. Same thing happened via USB and trying to run M997 S0 with the new firmware on the SD card.

This happened with both 3.01RC2 and stable 3.0.

Finally, before I went the erase route, I took a Raspberry Pi and installed the Duet3 Pi image. Uploaded new firmware and it updated correctly and everything seems fine. Not sure what the issue was with the Duet 3 but maybe if you have the same issue you can try this method - I don't think you even need to keep using the Raspberry Pi with the Duet 3 once firmware is up to date.