Z offset Not Doing Anything

dc42

Your slicer start script probably includes G28 but doesn't probe the bed before printing, so the G31 offset is never used. After G28, either run G32 to run auto calibration, or position the head a few mm above the centre of the bed and send G30 to do a single probe.

Jpmc86

Actually, my slicer does not include that. I just looked at the script for starting a print...

dc42

Can you show the first 50 or so lines from the GCode file you are trying to print?

Jpmc86

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Jpmc86

This post is deleted!

Jpmc86

@dc42 said in Z offset Not Doing Anything:

Can you show the first 50 or so lines from the GCode file you are trying to print?

Sure,

Here you go:

G90
M82
M106 S0
M140 S110
M190 S110
M104 S220 T0
M109 S220 T0
G92 E0
G1 E-6.4000 F3600
G1 Z4.090 F12000
; process Process1
; layer 1, Z = 0.090
T0
; tool H0.100 W0.528
; skirt
G1 X-43.668 Y43.546 F12000
G1 Z0.090 F12000
G1 E0.0000 F1080
G92 E0

Now Im confused though. Am I supposed to slide a piece of paper or feeler gauge and lower the right amount to barely touch with the nozzle and send the G92 Z0 command to set that as Z=0? Or does the auto calibration do that with my bed.g file?

dc42

I suggest you do either a G32 to auto calibrate before printing, or at least do a single probe (send the nozzle to 5mm above bed centre and execute G30). That will use the FSRs to establish an accurate Z=0 position. You can do either in your slicer start GCode.

Your config-override.g file is not being used because you don't have a M501 command near the end of config.g. Whether you want to use it is up to you.

wwmotorsports

I have a similar issue, but I am running auto-calibration and bed mesh in my startup script and do not home between the end of the bed mesh and the start of the print.

I still wind up baby stepping down .15mm at the beginning of each print, regardless of what I set my z-probe offset at...

dc42

@wwmotorsports said in Z offset Not Doing Anything:

I have a similar issue, but I am running auto-calibration and bed mesh in my startup script and do not home between the end of the bed mesh and the start of the print.

I still wind up baby stepping down .15mm at the beginning of each print, regardless of what I set my z-probe offset at...

Are you sure that increasing the G31 Z parameter by 0.15mm doesn't resolve that?

wwmotorsports

It appears that there was an error with the data in my config-override file not being used that was causing the issue. I deleted the config-override file and added the M501 command to the end of my startup script after the probing and the first layer height is perfect every time now. Thanks for the expert advice as usual!