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I had a Vcarve licence 10 years ago. Very unhappy buying crap for big money. Finally shredded the licence and software. No pros, just cons.

Even on the other motor ports the TMCs aren't responding.
The serial output didn't change.

 

Parts have arrived, here is my understanding of the wiring per 1 stepper:
meas card needs 5V supply
TB6600 should be powered with the voltage for the steppers (12V in my case to start with).

As I understand it the connections between TB6600 and mesa should be like in my bad sketch.

Thank you very much for your detailed explanation.
During testing, I tried using microstepping at 8, and I changed the scale in the ini file to 40. Then I set G-code "97: G1 X0 Y0 Z0 F300", and it ran successfully!
However, I don't understand why G-code "96: G1 X345 Y100 Z0 F600", runs properly with F600, but when I use G-code "97: G1 X0 Y0 Z0 F600", it fails to run. Why does line 96 run successfully with F600, but line 97 produces an error even though both use F600? Could you please help clarify this difference? Thank you.

If there was an issue with the motor0/1 not working at all, that could explain why the TMC drives werent working but maybe not. Just start up and check the remora serial output as you have been doing, and look for " TMC drivces OK" or something like that.

If the TMC drives dont get configured, they load the default settings, so your microsteps and current might not be what they are supposed to be.