Z-Offset Consistently High

[biggy238]

I need help understanding the Z offset system on the SV08.
Every time I initiate a print, it returns with an offset number roughly +0.900.
The printable offset is +/- 0.15mm, using PLA, which is causing me to have to calibrate for every print.
The machine restarts after Z calibration like it is storing the offset, but then on the consecutive print it is offset again.
I read some posts on reddit mentioning to change line 304 of macro.cfg to _CALIBRATION_ZOFFSET and made that change, but almost dug a ditch in the left edge of my bed plate.

Is this a mechanical offset of the inductive probe that needs to be corrected?
Some others on reddit suggested just adding the offset calibration to the macro for the filament.

[mistral]

I trust that is the expected behaviour but I am not sure. The only thing that I can tell is that :

• I have exactly the same behaviour with z offset (and that working well for the first layer without manual adjustments even if the z change at restart)
• I changed the configuration for the probe and that was a very big game changer for that you said (when the bed is cold, sometimes the print is cancelled before to print anything but I click to retry and it’s fine)

[probe]
pin: extra_mcu:PB6
x_offset: -17
y_offset: 10
speed: 10 #15.0
samples: 3 #2
sample_retract_dist: 5.0 #2.0
lift_speed: 25 # 50
samples_result: median # average
samples_tolerance: 0.0125 #0.016
samples_tolerance_retries: 10 #2

(You may find different variations of this change on internet but that is just fine tuning around the same idea)

For a better fix, some people changed the probe by a better one (I did not for now, maybe later)

[biggy238]

I ended up making the changes as outlined in one of gERGO’s YouTube videos. After this, and mesh calibration, the prints have started with a reasonable enough offset to print.
This includes changing the profiles in the slicer to allow heat soak at more appropriate temperatures.