SET_STEPPER_ENABLE not working after homing is done

General Discussion
1

Hi,
I habe an Ender 3V2 Printer with Creality V4.2.2 board.

I use a direct drive, so disabling an extruder motor for a filament change would be very handy.
However, G Code SET_STEPPER_ENABLE does not disable or enable stepper motors after homing is done.
It means, i cannot use it in macro during print.

However, if motors were disabled by M18 or M84, SET_STEPPER_ENABLE STEPPER=[stepper name] ENABLE=1 turns ALL stepper motors on and … ENABLE=0 switches them off again. So it doesn’t seem to work with a single stepper, but for all of them at the same time.

Is it somehow possible to make this command work for a single stepper without stopping the print?
Or does it work only for stepper drivers in UART mode?

2

I’m not familiar with that particular printer, but several Ender printers have just one wire to control the enable state of several motors - in that case, there’s nothing the software can do to selectively enable just one motor.

-Kevin

3

Why do you want disable motors after homing?
If you disable the motors after homing, Klipper assumes the positions are not correct any more. In particular the X, Y and Z axis. The E axis is not homed. So you have to home again.

Disabling the motors only make sense after a print.

4

Ok, that could be the reason. The drivers are in standalone mode, not even UART on the board, so i guess, they could be really controlled by a single wire. I should look into schematic then.

UPD.:
Yes, that should be it. The steppers are all disabled at once, when i do it for each single motor at the same time:

SET_STEPPER_ENABLE STEPPER=extruder ENABLE=0
SET_STEPPER_ENABLE STEPPER=stepper_x ENABLE=0
SET_STEPPER_ENABLE STEPPER=stepper_y ENABLE=0
SET_STEPPER_ENABLE STEPPER=stepper_z ENABLE=0

But if I enable at least one, all four of them are switched on.

5

I only need to do it for an extruder during filament change, not for axis motors.