Ironing fails on small line widths #1450

New Issue

MrUnknownDE · 2026-04-05T17:48:23+02:00

MrUnknownDE commented

2026-04-05 17:48:23 +02:00

Originally created by @Behem07h on 12/1/2025

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 10

Additional system information

CPU: AMD Ryzen 7 4800H
Memory: 16GB
GPU: NVIDIA GeForce GTX 1650 Ti (Dedicated), AMD Radion(TM) Graphics (Integrated)

Printer

Ender 3 V2

How to reproduce

Slice a model with ironing enabled, small nozzle size, line width = nozzle size, and ironing line overlap < nozzle size. Choose any ironing mode (This issue happens with all top surfaces, topmost surface, and all solid surfaces ironing modes.)
Ironing is only shown on some top surfaces

Actual results

Ironing only shows on some top surfaces, and does not even cover the surfaces it is shown on.

Expected results

Ironing is applied to the selected surfaces (all, topmost or all solid)

Project file & Debug log uploads

ironing_bug_report_behem07h.zip

ironing_bug_log_behem07h.zip

Checklist of files to include

Log file
Project file

Anything else?

as seen below, ironing covers the expected surfaces when the 0.4mm nozzle profile is selected, but breaks with the 0.1mm profile.

*Originally created by @Behem07h on 12/1/2025* ### 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 10 ### Additional system information CPU: AMD Ryzen 7 4800H Memory: 16GB GPU: NVIDIA GeForce GTX 1650 Ti (Dedicated), AMD Radion(TM) Graphics (Integrated) ### Printer Ender 3 V2 ### How to reproduce 1. Slice a model with **ironing enabled**, small nozzle size, line width = nozzle size, and ironing line overlap < nozzle size. Choose any ironing mode (This issue happens with all top surfaces, topmost surface, and all solid surfaces ironing modes.) 2. Ironing is only shown on some top surfaces ### Actual results Ironing only shows on some top surfaces, and does not even cover the surfaces it is shown on. ### Expected results Ironing is applied to the selected surfaces (all, topmost or all solid) ### Project file & Debug log uploads [ironing_bug_report_behem07h.zip](https://github.com/user-attachments/files/23860646/ironing_bug_report_behem07h.zip) [ironing_bug_log_behem07h.zip](https://github.com/user-attachments/files/23860649/ironing_bug_log_behem07h.zip) ### Checklist of files to include - [x] Log file - [x] Project file ### Anything else? as seen below, ironing covers the expected surfaces when the 0.4mm nozzle profile is selected, but breaks with the 0.1mm profile. <img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/3a6d6e90-710b-4b6f-aa77-1a41d1c3c909" /> <img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/470da855-d8a2-4ab7-8c0c-4d3564c2ddab" />

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Reference: github/OrcaSlicer#1450