Support Material Collision on Scarf Seam Travel Moves #2105

New Issue

MrUnknownDE · 2026-04-05T23:46:31+02:00

MrUnknownDE commented

2026-04-05 23:46:31 +02:00

Originally created by @chaid0 on 9/21/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.1-beta Build 3c0c36d

Operating System (OS)

Windows

OS Version

Windows 10

Additional system information

No response

Printer

Custom Klipper Printer

How to reproduce

Load a simple bridge. e.g. two posts with a bridge between.
Turn on tree supports and scarf joint seam. Add supports to the bridge and modify settings as needed to ensure that support material is added underneath the bridge i.e. turn off "don't support bridges"
Slice. View toolpaths.

Actual results

The toolpath first prints the support material, then will print one post of the bridge, and then travel to the lower scarf seam position of the second post, and then print the second post. If support material along the travel move between the posts of the bridge, then the nozzle will collide with the support material.

See photos below to see before and after travel, with the reduction to the Z height causing a collision with the previously printed support material.

Z position is 21.0 before travel move:

Z position is 20.4 after travel move, causing a collision with the support material in its path that was previously printed at Z=21.0

Expected results

The toolpath should cause the print to first move to the XY position and then dropping to the Z position of the seam to begin the scarf seam instead of moving to the XYZ position in one go.

Project file & Debug log uploads

Dryer Heater Shroud v3 (1).zip

Checklist of files to include

Log file
Project file

Anything else?

No response

*Originally created by @chaid0 on 9/21/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.1-beta Build 3c0c36d ### Operating System (OS) Windows ### OS Version Windows 10 ### Additional system information _No response_ ### Printer Custom Klipper Printer ### How to reproduce 1. Load a simple bridge. e.g. two posts with a bridge between. 2. Turn on tree supports and scarf joint seam. Add supports to the bridge and modify settings as needed to ensure that support material is added underneath the bridge i.e. turn off "don't support bridges" 3. Slice. View toolpaths. ### Actual results The toolpath first prints the support material, then will print one post of the bridge, and then travel to the lower scarf seam position of the second post, and then print the second post. If support material along the travel move between the posts of the bridge, then the nozzle will collide with the support material. See photos below to see before and after travel, with the reduction to the Z height causing a collision with the previously printed support material. Z position is 21.0 before travel move: <img width="1193" height="891" alt="Image" src="https://github.com/user-attachments/assets/86d13d44-f28b-4c86-bd17-44e655baa758" /> Z position is 20.4 after travel move, causing a collision with the support material in its path that was previously printed at Z=21.0 <img width="1119" height="891" alt="Image" src="https://github.com/user-attachments/assets/76813cd3-e1b4-4baf-a9e6-36c1a89a8853" /> ### Expected results The toolpath should cause the print to first move to the XY position and then dropping to the Z position of the seam to begin the scarf seam instead of moving to the XYZ position in one go. ### Project file & Debug log uploads [Dryer Heater Shroud v3 (1).zip](https://github.com/user-attachments/files/22454989/Dryer.Heater.Shroud.v3.1.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? _No response_

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Reference: github/OrcaSlicer#2105