Fan speed does not get restored after ironing #2088

New Issue

MrUnknownDE · 2026-04-05T23:33:57+02:00

MrUnknownDE commented

2026-04-05 23:33:57 +02:00

Originally created by @arr-ee on 9/23/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.1-beta

Operating System (OS)

macOS

OS Version

15.6.1

Additional system information

No response

Printer

Bambu P1S

How to reproduce

See attached project for a repro case.

Set fan speed during ironing (Filament settings -> Cooling -> Ironing Fan Speed) to be different to main speed (e.g. 20% for a generic PLA profile)
Enable ironing -> all top surfaces in slicer settings.
Add model(s) and set up the plate so that ironing happens as the last operation on a layer (in the attached project, this is done by ordering models “mid -> big -> smol“ in process -> objects.
Slice the plate and export the result.
Rearrange models so that ironing is not the last operation (drag ”big” to be the last in list.)
Slice the plate and export the result.
Compare results in “fan speed” views.

Actual results

In the first case, fan speed remains at 20% for four layers, until “mid” model gets ironed, and fan speed resets to 100%.

Expected results

In both cases, fan speed is 100% everywhere except for the first layer (expected) and top layers of each model, where it drops to 20%.

Project file & Debug log uploads

ironing_bug_spool_bobbin_repro.zip
ironing_fan_three_cubes_repro.zip

Checklist of files to include

Log file
Project file

Anything else?

While going through my repro cases I stumbled upon a new one that I don’t understand at all (see Spool_holder project/stl), where fan speed changes midway printing an outer wall several layers too late. Previously, this model was slicing with 20% fan speed all the way from the first ironing layer.

*Originally created by @arr-ee on 9/23/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.1-beta ### Operating System (OS) macOS ### OS Version 15.6.1 ### Additional system information _No response_ ### Printer Bambu P1S ### How to reproduce See attached project for a repro case. 1. Set fan speed during ironing (Filament settings -> Cooling -> Ironing Fan Speed) to be different to main speed (e.g. 20% for a generic PLA profile) 2. Enable ironing -> all top surfaces in slicer settings. 3. Add model(s) and set up the plate so that ironing happens as the last operation on a layer (in the attached project, this is done by ordering models “mid -> big -> smol“ in process -> objects. 4. Slice the plate and export the result. 5. Rearrange models so that ironing is not the last operation (drag ”big” to be the last in list.) 6. Slice the plate and export the result. 7. Compare results in “fan speed” views. ### Actual results In the first case, fan speed remains at 20% for four layers, until “mid” model gets ironed, and fan speed resets to 100%. <img width="804" height="465" alt="Image" src="https://github.com/user-attachments/assets/8737aee9-18cd-49eb-89c5-353a2d512404" /> ### Expected results In both cases, fan speed is 100% everywhere except for the first layer (expected) and top layers of each model, where it drops to 20%. ### Project file & Debug log uploads [ironing_bug_spool_bobbin_repro.zip](https://github.com/user-attachments/files/22499815/ironing_bug_spool_bobbin_repro.zip) [ironing_fan_three_cubes_repro.zip](https://github.com/user-attachments/files/22499816/ironing_fan_three_cubes_repro.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? While going through my repro cases I stumbled upon a new one that I don’t understand at all (see `Spool_holder` project/stl), where fan speed changes midway printing an outer wall several layers too late. Previously, this model was slicing with 20% fan speed all the way from the first ironing layer. <img width="946" height="626" alt="Image" src="https://github.com/user-attachments/assets/cfcc8e0b-3184-446e-8069-66ee090d590a" />

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Reference: github/OrcaSlicer#2088