Fan speed is not set to zero when "No cooling for the first X layers" is nonzero #1830

New Issue

MrUnknownDE · 2026-04-05T20:16:39+02:00

MrUnknownDE commented

2026-04-05 20:16:39 +02:00

Originally created by @NameOfTheDragon on 10/25/2025

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

11

Additional system information

No response

Printer

Voron 2.4 with ERCF/Happy Hare

How to reproduce

Turn on the part cooling fan to say 50%
Start a print that has "No cooling for first x layers" set to nonzero, say 5.
Observe that the fan speed continues at 50% for the first 5 layers.

Actual results

The fan speed is not set to zero at the start of the print and continues at whatever speed it was previously set to. This is incompatible with the "no cooling" setting.

Expected results

When the slicer intends "no cooling" then it should set the fan speed to zero with M106 S0 and not assume that the fan is off at print start.

Project file & Debug log uploads

5U Vertical Post.zip

Checklist of files to include

Log file
Project file

Anything else?

No response

*Originally created by @NameOfTheDragon on 10/25/2025* ### 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 11 ### Additional system information _No response_ ### Printer Voron 2.4 with ERCF/Happy Hare ### How to reproduce 1. Turn on the part cooling fan to say 50% 2. Start a print that has "No cooling for first x layers" set to nonzero, say 5. 3. Observe that the fan speed continues at 50% for the first 5 layers. ### Actual results The fan speed is not set to zero at the start of the print and continues at whatever speed it was previously set to. This is incompatible with the "no cooling" setting. ### Expected results When the slicer intends "no cooling" then it should set the fan speed to zero with M106 S0 and not assume that the fan is off at print start. ### Project file & Debug log uploads [5U Vertical Post.zip](https://github.com/user-attachments/files/23142752/5U.Vertical.Post.zip) ### Checklist of files to include - [ ] Log file - [ ] Project file ### Anything else? _No response_

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Reference: github/OrcaSlicer#1830