Incorrect travel path and purge behavior after manual filament change causes color bleed and tower collision #67

New Issue

MrUnknownDE · 2026-04-05T16:18:19+02:00

MrUnknownDE commented

2026-04-05 16:18:19 +02:00

Originally created by @AbubakarSiddique on 3/30/2026

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.2

Operating System (OS)

Windows

OS Version

Windows 11

Additional system information

No response

Printer

Bambu Lab A1 Mini

How to reproduce

During Manual Filament Change, after resuming the print, the toolhead performs an incorrect movement sequence:

Travels to the model area first
Then moves to the purge tower

This results in a visible color dot/bleed on the model before purging occurs.

Additionally, when the nozzle reaches the purge tower:

A large filament blob is extruded
The toolhead rubs aggressively over the blob, causing unstable motion and potential print artifacts

Reproduce:
Slice a multi-color model using Manual Filament Change
Enable purge tower
Start print
When prompted:
Pause occurs
Manually insert new filament
Resume print
Observe:
Initial travel to model before purge
Blob formation and nozzle rubbing at tower

Actual results

Toolhead moves to model before purge → causes unintended color deposition
Excess filament accumulates at purge start → nozzle collides/rubs against blob

Expected results

Expected Behavior
After resume, toolhead should:
Move directly to purge tower
Perform purge/prime
Then resume printing on model
Purge tower behavior should:
Avoid excessive blob formation
Ensure smooth, controlled extrusion without collision or dragging

Project file & Debug log uploads

Demo.zip

Checklist of files to include

Log file
Project file

Anything else?

No response

*Originally created by @AbubakarSiddique on 3/30/2026* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.2 ### Operating System (OS) Windows ### OS Version Windows 11 ### Additional system information _No response_ ### Printer Bambu Lab A1 Mini ### How to reproduce During Manual Filament Change, after resuming the print, the toolhead performs an incorrect movement sequence: Travels to the model area first Then moves to the purge tower This results in a visible color dot/bleed on the model before purging occurs. Additionally, when the nozzle reaches the purge tower: A large filament blob is extruded The toolhead rubs aggressively over the blob, causing unstable motion and potential print artifacts Reproduce: Slice a multi-color model using Manual Filament Change Enable purge tower Start print When prompted: Pause occurs Manually insert new filament Resume print Observe: Initial travel to model before purge Blob formation and nozzle rubbing at tower ### Actual results Toolhead moves to model before purge → causes unintended color deposition Excess filament accumulates at purge start → nozzle collides/rubs against blob ### Expected results Expected Behavior After resume, toolhead should: Move directly to purge tower Perform purge/prime Then resume printing on model Purge tower behavior should: Avoid excessive blob formation Ensure smooth, controlled extrusion without collision or dragging ### Project file & Debug log uploads [Demo.zip](https://github.com/user-attachments/files/26354984/Demo.zip) ### Checklist of files to include - [ ] Log file - [ ] Project file ### Anything else? _No response_

MrUnknownDE added the bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug bug labels 2026-04-05 16:18:19 +02:00

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Reference: github/OrcaSlicer#67