Understanding Z-offset in custom firmware

Steve

Probably me misunderstanding something. Flashed new A5S with custom firmware (latest stable release). Mesh bed leveling seems to work well. During the initial stages of printing I go under tune and adjust Z-height from 0.00 to say -0.035 to get a better first layer. Baby stepping seems to work great. Print finishes and I turn off printer.

Now here is my confusion. When I go to print something else my Z-offset still reads -0.035. When I go to start printing, I can tell I am a bit to high and have to lower the z-height by baby stepping again. So now for my second print I am at -0.070 my third -0.105 etc. I must be doing something silly or missing something.

Here is my start G-code

; -- START GCODE --

G21 ;set units to millimetres

G90 ;set to absolute positioning

M106 S0 ;set fan speed to zero (turned off)

G28 ;home all axis

M420 S1 ;turn on mesh bed levelling if enabled in firmware

G92 E0 ;zero the extruded length

G1 Z1 F1000 ;move up slightly

G1 X60.0 Z0 E9.0 F1000.0;intro line

G1 X100.0 E21.5 F1000.0 ;continue line

G92 E0 ;zero the extruded length again

; -- end of START GCODE --

Samuel Pinches

Welcome Steve! I'm away from my printer, so I can't really check this one for you right now.

Try this:

1. make a new text file. Call it "Reset Z-Offset".

2. Add these two lines:

M206 Z0 ; set offset to zero

M500 ; save to eeprom

3. copy file to printer

4. run when desired (Select file on printer and "print" it.)

Steve

Thanks for the follow up. I will give this a go and get back to you.