# Sovol S07+ doesn't save negative z\_offset correctly - firmware bug

**URL:** <https://forum.sovol3d.com/t/sovol-s07-doesnt-save-negative-z-offset-correctly-firmware-bug/4475>\
**Category:** Sovol SV07 Plus\
**Created:** [February 8, 2024, 2:10pm UTC](https://forum.sovol3d.com/t/sovol-s07-doesnt-save-negative-z-offset-correctly-firmware-bug/4475 "2024-02-08T14:10:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ForenSeil](https://avatars.discourse-cdn.com/v4/letter/f/7cd45c/32.png) [@ForenSeil](https://forum.sovol3d.com/u/ForenSeil)\
**Post date:** [February 8, 2024, 2:10pm UTC](https://forum.sovol3d.com/t/sovol-s07-doesnt-save-negative-z-offset-correctly-firmware-bug/4475/1 "2024-02-08T14:10:00Z")

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Hi!  
When leveling bed via the menue I’m getting a Z-Offset of -1.95  
When saving and restarting the printer it changes that value to +1.95, so a difference of 3.9mm - it prints into the air!

So I have to lower the Z-Axis every print manually by 3.9mm while the print starts -.-

How to avoid that?

Kind regards  
ForenSeil

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**Author:** ![ForenSeil](https://avatars.discourse-cdn.com/v4/letter/f/7cd45c/32.png) [@ForenSeil](https://forum.sovol3d.com/u/ForenSeil)\
**Post date:** [February 10, 2024, 7:53am UTC](https://forum.sovol3d.com/t/sovol-s07-doesnt-save-negative-z-offset-correctly-firmware-bug/4475/2 "2024-02-10T07:53:11Z")

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Addition: I bet this guy has the same problem

> [@Can't get the probe z offset to work on sv06](https://forum.sovol3d.com/t/cant-get-the-probe-z-offset-to-work-on-sv06/848/11):
>
> Did anyone find a solution for this? My sv06 out of the box does absolutely nothing when i cluck on the z offset. The numbers on the screen change. However the head does not move up and down. I have to fake the numbers in configurations to get it even close. Yes i scratched the bed. Made me super happy on brand new machine

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**Author:** ![underscoren](https://avatars.discourse-cdn.com/v4/letter/u/f05b48/32.png) [@underscoren](https://forum.sovol3d.com/u/underscoren)\
**Post date:** [April 7, 2025, 5:03pm UTC](https://forum.sovol3d.com/t/sovol-s07-doesnt-save-negative-z-offset-correctly-firmware-bug/4475/3 "2025-04-07T17:03:44Z")

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I’ve recently got a SV07+ too and was having the same issue.

“Solved” it by doing the z-offset calibration via the Klipper WebUI (mainsail). Other calibration didn’t have any problems and the benchy preinstalled on the USB printed well. Prints as expected via both the touchscreen and main sail.

One other thing to watch out for was the remnants of the filament from the Sovol factory test print left in the nozzle, it didn’t leak out and took a bit of extruding to get it all out. I think I should have heated the nozzle a bit higher (used 200C).