I previously set up my Ender 3 with a precompiled binary of Marlin that already had the correct X and Y offsets for the attached BLTouch. Now I'm compiling my own, and rather than measure for myself I'd like to just use the same numbers.
When I send
M851 through the terminal, it gives me the current value for the probe's Z offset from the extruder. I know I can also use
M851 to set the X and Y offset, but there doesn't seem to be a way to read the current values.
Is there any way to query the printer for the current values of
Y_PROBE_OFFSET_FROM_EXTRUDER? Or, ideally, for any other arbitrary variable?