Very incorrect slowing down for overhangs on Prusa XL print profiles #2015

New Issue

MrUnknownDE · 2026-04-05T22:35:44+02:00

MrUnknownDE commented

2026-04-05 22:35:44 +02:00

Originally created by @ubershy on 10/2/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.1-beta

Operating System (OS)

Windows

OS Version

Windows 10

Additional system information

No response

Printer

Prusa XL 5T and Prusa XL

How to reproduce

Select Prusa XL 5T printer with 0.4mm nozzle, PLA filament and some fast print profile for PRUSA XL 5T.
See that the print settings for slowing down on overhangs are incorrect
(Optional) Right click on the build plate and select "Add handy models" => "Slice "Autodesk FDM Test". Slice it and select speed view. See that the extreme overhangs are fast, while easy overhangs are very slow

Actual results

Incorrect slicing settings for slowing down on overhangs

This is how it looks sliced

So basically, it is fast on extreme overhangs, but slow on easy overhangs, which is wrong

Expected results

Speed should be fast on easy overhangs, but slow on extreme overhangs, just like for any other printers. Prusa slicer has it correct, but not orca slicer.

Project file & Debug log uploads

incorrect_overhang_speeds.zip

Checklist of files to include

Log file
Project file

Anything else?

Print profiles for other nozzle sizes and for Prusa XL with one tool are also affected.

*Originally created by @ubershy on 10/2/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.1-beta ### Operating System (OS) Windows ### OS Version Windows 10 ### Additional system information _No response_ ### Printer Prusa XL 5T and Prusa XL ### How to reproduce 1. Select Prusa XL 5T printer with 0.4mm nozzle, PLA filament and some fast print profile for PRUSA XL 5T. 2. See that the print settings for slowing down on overhangs are incorrect 3. (Optional) Right click on the build plate and select "Add handy models" => "Slice "Autodesk FDM Test". Slice it and select speed view. See that the extreme overhangs are fast, while easy overhangs are very slow ### Actual results Incorrect slicing settings for slowing down on overhangs <img width="581" height="351" alt="Image" src="https://github.com/user-attachments/assets/1661d4e6-802f-4775-9f4b-e1c4e1c84ecf" /> This is how it looks sliced <img width="1451" height="705" alt="Image" src="https://github.com/user-attachments/assets/5b1f8cfc-26c7-478c-add7-218d37f358d3" /> So basically, it is fast on extreme overhangs, but slow on easy overhangs, which is wrong ### Expected results Speed should be fast on easy overhangs, but slow on extreme overhangs, just like for any other printers. Prusa slicer has it correct, but not orca slicer. ### Project file & Debug log uploads [incorrect_overhang_speeds.zip](https://github.com/user-attachments/files/22664200/incorrect_overhang_speeds.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? Print profiles for other nozzle sizes and for Prusa XL with one tool are also affected.

MrUnknownDE closed this issue

2026-04-05 22:35:44 +02:00

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Reference: github/OrcaSlicer#2015