Set MANUAL_Z_HOME_POS for deltas with EEPROM

[superlou]

I've had a lot of luck using the Escher 3D wizard for a delta printer to calibrate endstop corrections and rod lengths. The output of the wizard looks like the following:

M665 R172.11 L355.00
M666 X-0.00 Y0.00 Z-0.34
; Set homed height 299.88mm in config.h

The first two commands can be entered easily over a terminal and saved via M500, but the last one requires opening up the IDE, recompiling, and uploading to the controller. It's not unfeasible, but a little tedious. Is there already a way to specify this parameter and save/load it from EEPROM? If so, I'll reach out to Escher about updating the wizard. If not, could this become a feature down the road?

[LVD-AC]

This can be easily achieved by changing home_offset[Z_AXIS];

the delta height used in calculations= MANUAL_Z_HOME_POS DELTA_HEIGHT + home_offset[Z_AXIS]

home_offset[X_AXIS and Y_AXIS] have no meaning on delta machines, so it could be a good idea to disable M206 and M428 on deltas.

If you want it a bit more structured:

In configuration.h ... add in delta settings:

define DELTA_HEIGHT 270 //mm

... and change:

define MANUAL_Z_HOME_POS DELTA_HEIGHT

In marlin_main.cpp: ... after: inline void gcode_M665() { ... add: if (code_seen('H')) home_offset[Z_AXIS] = code_value_linear_units()- DELTA_HEIGHT;

And in configuration.store.cpp: ... change: SERIAL_ECHOLNPGM("Delta settings: L=diagonal_rod, R=radius, H=height, ... ... and after: SERIAL_ECHOPAIR(" R", delta_radius); ... add: SERIAL_ECHOPAIR(" H", DELTA_HEIGHT + home_offset[Z_AXIS]);

done (#4022)

These changes are needed for calibration routine #6182

[boelle]

@thinkyhead can we close this one since a PR has been submitted?

[LVD-AC]

May be closed since this feature was incorporated in marlin 1.1.0

[github-actions[bot]]

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