Nozzle Lowers Dangerously Before First XY Move #1985

New Issue

MrUnknownDE · 2026-04-05T22:06:46+02:00

MrUnknownDE commented

2026-04-05 22:06:46 +02:00

Originally created by @SamBytess on 10/5/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.0

Operating System (OS)

Windows

OS Version

Windows 11

Additional system information

No response

Printer

Ender 6 with Biqu H2 V2 Extruder

How to reproduce

Enable Z-hop (e.g., 0.4 mm) in Print Settings → Retraction.
Slice any model.
Inspect the generated G-code just after the start G-code and prime line.
Observe this line before the first XY movement:
G1 Z.6 F9000
Set Z-hop = 0 mm and re-slice — the line disappears.

Actual results

When Z-hop is enabled (e.g., 0.4 mm), OrcaSlicer inserts the following G-code line just before the first XY move:

  `G1 Z.6 F9000   ; (G1 Z{ZHop+0.2} F9000)`

This causes the nozzle to lower unnecessarily and dangerously before moving to the first XY location to start printing.
The nozzle has already been raised by the PRIME_LINE macro in the start G-code, so it should remain high until the printer reaches the first print location.
When Z-hop is set to 0 mm, this line does not appear.

Expected results

While Z remains high, the printer should move to the first print location first, and only then lower Z to start printing the model’s first layer.
The correct move should simply be:

G1 F9000

(without any Z movement).

Project file & Debug log uploads

ZHopTestCube.zip

Checklist of files to include

Log file
Project file

Anything else?

No response

*Originally created by @SamBytess on 10/5/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.0 ### Operating System (OS) Windows ### OS Version Windows 11 ### Additional system information _No response_ ### Printer Ender 6 with Biqu H2 V2 Extruder ### How to reproduce 1. Enable Z-hop (e.g., 0.4 mm) in Print Settings → Retraction. 2. Slice any model. 3. Inspect the generated G-code just after the start G-code and prime line. 4. Observe this line before the first XY movement: `G1 Z.6 F9000` 5. Set Z-hop = 0 mm and re-slice — the line disappears. ### Actual results When Z-hop is enabled (e.g., 0.4 mm), OrcaSlicer inserts the following G-code line just before the first XY move: `G1 Z.6 F9000 ; (G1 Z{ZHop+0.2} F9000)` This causes the nozzle to lower unnecessarily and dangerously before moving to the first XY location to start printing. The nozzle has already been raised by the PRIME_LINE macro in the start G-code, so it should remain high until the printer reaches the first print location. When Z-hop is set to 0 mm, this line does not appear. ### Expected results While Z remains high, the printer should move to the first print location first, and only then lower Z to start printing the model’s first layer. The correct move should simply be: ` G1 F9000` (without any Z movement). ### Project file & Debug log uploads [ZHopTestCube.zip](https://github.com/user-attachments/files/22710642/ZHopTestCube.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? _No response_

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Reference: github/OrcaSlicer#1985