When updating firmware, this will change the Z offset for the printer back to stock firmware. We would like to add a notice on the pop up when flashing firmware to note the Z offset and how to update it once done flashing.
We can get the Z offset from three separate locations at the moment.
1.) Calibration paperwork shipped with the printer
2.) From the console by entering an M851 command
3.) From the GLCD on printers that are equipped with them
At the moment, I tend to lean toward just documenting the M851 as this will cover all printers and report any adjustments the customer may or may not have made.
"When updating your firmware, your Z offset will be set back to the number defined in the firmware before calibration. Before updating, connect to the printer and open the console in the monitor tab. Type in "M851" and hit enter. Record this number, and after flashing the firmware update by opening the Console and typing "M851 Z-x.xx" where x.xx is the number previously reported. Type "M500" to save this setting to your printer.