very minor issue: latest rcbugfix does not have the m851 definition in configuration.h

[DjDemonD]

Previous RC version have included:

_// Custom M code points

define CUSTOM_M_CODES

if ENABLED(CUSTOM_M_CODES)

#if ENABLED(AUTO_BED_LEVELING_FEATURE)
#define CUSTOM_M_CODE_SET_Z_PROBE_OFFSET 851
#define Z_PROBE_OFFSET_RANGE_MIN -20
#define Z_PROBE_OFFSET_RANGE_MAX 20
#endif

endif_

In the additional features section of configuration.h.
Has it been omitted intentionally or just accidentally?
Without this m code setting z offset after measuring distance from probing point to nozzle is more difficult. I tried with m206 but whichever way I set it i.e. m206 z-2 or m206 z2 it did not move the nozzle to the bed on start of printing. Using m851 z-2 this functions perfectly.

[ghost]

I haven't knowledge of those, but it looks like that CUSTOM_M_CODES and CUSTOM_M_CODE_SET_Z_PROBE_OFFSET were abolished
in the merged PR #4066 (Make M851 standard with a bed probe) and PR #4085 (Fix M851).
But it looks like that Z_PROBE_OFFSET_RANGE_MIN and Z_PROBE_OFFSET_RANGE_MAX are still valid.

[DjDemonD]

So with the version of bugfix I am testing right now (18-06-16) I cannot send m851 or receive any info using m851 but it is still a variable in the eeprom, even if I reset eeprom to defaults. My console shows
echo: M851 Z0 at the end of the eeprom m501 readout. But it does not return echo: Z Offset: z-0.x.

However if I restore the configuration I quoted above (custom m codes) to the configuration.h in the additional features section of this version of bugfix, then this functionality returns.
Two things spring to mind (and they may be wrong if I am not understanding this well enough)

1. its an omission and needs to be put back in
2. its deliberate - in which case I presume probe offset entered in configuration.h under

_#define Z_PROBE_OFFSET_FROM_EXTRUDER 0 // Z offset: -below +above [the nozzle]

is automatically utilised to position/lower the nozzle when printing begins, after homing/autolevelling.
If this is the case then its a backwards step, when adjusting probes/bed level etc.. the ability to change the z offset from the console/LCD and then save to eeprom is extremely useful. Changing the firmware and re-uploading it is time consuming.

[RicardoGA]

@DjDemonD download the latest rcbugfix that problem was fixed yesterdad, the change is deliberate to standarize the gcode, with the latest rcbugfix to ajust rhe z ofset you should send (ex: m851 z-2.0)

[jbrazio]

It was intentional with PR #4066.

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