Setting Z-Offset starts print too high or too low #1968

New Issue

MrUnknownDE · 2026-04-05T21:52:01+02:00

MrUnknownDE commented

2026-04-05 21:52:01 +02:00

Originally created by @666thetalent on 10/8/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.1

Operating System (OS)

Windows

OS Version

Windows 11

Additional system information

CPU: AMD Ryzen7 7800 X3D
GPU: AMD RADEON 7900 XTX
RAM: 32GB DDR5

Printer

Creality Ender 3 V3 KE

How to reproduce

Set Z-Offset in the printer settings to any value except 0

Actual results

When setting the Z-Offset in Orca, the path calculated by the slicer will start higher or lower than it should.
Setting a positive offset makes the print head start lower by the set value, setting a negative offset makes it start higher. While printing the first line, it will gradually raise or lower to the desired Z-Height and print normally from there.
The issue however is that using a negative offset makes the first line be printed into thin air and not stick and using a positive offset would likely press the printing head into the print bed (I have not tested this with a print of course, but it's visible in Orca)

Also, this makes one layer of the print dissapear, e.g. when using a high offset of .6 mm, the third layer of the print dissapears (with layer height .2mm).

Expected results

The print should not start higher or lower and then gradually traverse to the correct height, but be at the correct height from the get go.

Project file & Debug log uploads

Cube-with-negative-0.6mm-offset.zip

Checklist of files to include

Log file
Project file

Anything else?

The first layer of the print when setting offset to -0.6mm:

The first layer of the print when setting offset to 0mm:

The first layer of the print when setting offset to +0.6mm (viewed from below the print bed):

The missing layer (happens on every print with a negative offset):

*Originally created by @666thetalent on 10/8/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.1 ### Operating System (OS) Windows ### OS Version Windows 11 ### Additional system information CPU: AMD Ryzen7 7800 X3D GPU: AMD RADEON 7900 XTX RAM: 32GB DDR5 ### Printer Creality Ender 3 V3 KE ### How to reproduce Set Z-Offset in the printer settings to any value except 0 ### Actual results When setting the Z-Offset in Orca, the path calculated by the slicer will start higher or lower than it should. Setting a positive offset makes the print head start lower by the set value, setting a negative offset makes it start higher. While printing the first line, it will gradually raise or lower to the desired Z-Height and print normally from there. The issue however is that using a negative offset makes the first line be printed into thin air and not stick and using a positive offset would likely press the printing head into the print bed (I have not tested this with a print of course, but it's visible in Orca) Also, this makes one layer of the print dissapear, e.g. when using a high offset of .6 mm, the third layer of the print dissapears (with layer height .2mm). ### Expected results The print should not start higher or lower and then gradually traverse to the correct height, but be at the correct height from the get go. ### Project file & Debug log uploads [Cube-with-negative-0.6mm-offset.zip](https://github.com/user-attachments/files/22782222/Cube-with-negative-0.6mm-offset.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? **The first layer of the print when setting offset to -0.6mm:** <img width="1936" height="1297" alt="Image" src="https://github.com/user-attachments/assets/88507408-e792-4a55-ba30-f9345c1dd39d" /> **The first layer of the print when setting offset to 0mm:** <img width="1938" height="1296" alt="Image" src="https://github.com/user-attachments/assets/66cc757f-eab3-4b90-ab03-c7d9578124d7" /> **The first layer of the print when setting offset to +0.6mm (viewed from _below_ the print bed):** <img width="1936" height="1295" alt="Image" src="https://github.com/user-attachments/assets/8caafd28-44e6-4d23-bb6e-372d25ef9e60" /> **The missing layer (happens on every print with a negative offset):** <img width="1933" height="1297" alt="Image" src="https://github.com/user-attachments/assets/2341500a-f0c9-4bb6-9437-875e55c0cce7" />

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Reference: github/OrcaSlicer#1968