Correct 'Change filament g-code (M600)' to start at new color location #1620

New Issue

MrUnknownDE · 2026-04-05T18:42:06+02:00

MrUnknownDE commented

2026-04-05 18:42:06 +02:00

Originally created by @truegret on 11/16/2025

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 11

Additional system information

Processor AMD Ryzen 5 5600U with Radeon Graphics (2.30 GHz)
Installed RAM 16.0 GB (13.9 GB usable)
System type 64-bit operating system, x64-based processor

Printer

Creality 10S 300mm x 300mm x 400mm

How to reproduce

Created a multi-body model in Fusion 360
Export all bodies in '3MF' file format
Import the 3MF file as a new project/plate in Orca
Set each body to have a different filament (color)
Add 'M600 B5 E-0.1 L20 R210 T0 U50 X150.00 Y20.00 Z50.00' to 'Change filament G-code section
Slice plate
Export gcode
In this case, I am using Simplify-3d v4.1.2, import G-code file to preview and print

Actual results

When color/filament change occurs,
M600 B5 E-0.1 L20 R210 T0 U50 X150.00 Y20.00 Z50.00

after new color is in the extruder, the print-head moves to the previous position, touches the model, moves up and advances to the start location of the 'new color'. This occurs on each filament/color change. When this occurs, a small 'zit' of the new color is left on the previous color.

Expected results

Expected/desired is to have the insertion of the
'Printer' -> 'Machine G-code' -> 'Change filament g-code'

section/code be after the new color/filament coordinates, and begin printing. This allows for a cleaner print.

Project file & Debug log uploads

Please find the Orca project file, 'CatWithAHat.3mf', and the Fusion 360 multi-body file 'F360_CatWithAHat.3mf'

F360_CatWithAHat.zip

Checklist of files to include

Log file
Project file

Anything else?

I believe this is a bug. The 'zit' of the previous color (especially darker new color on previous light color) is annoying and difficult to remove. I have to edit the gcode in a text editor, search for M600 and move the color change code to the first coordinate of the new color.

Current (bug code):
G1 X187.104 Y69.78 E.03201
;Color Change GCode START
M600 B5 E-0.1 L20 R205 T0 U50 X150.00 Y20.00 Z50.00
;Color Change GCode END
; stop printing object Assembly id:15 copy 0
; filament end gcode
G1 E-1.2 F960
G1 Z5.24 F3300
G1 X162.022 Y59.55
G1 Z5.24
G1 Z4.12
G1 E1.2 F960

Expected/desired gcode:
;Color Change GCode START
G1 X187.104 Y69.78 E.03201
; stop printing object Assembly id:15 copy 0
; filament end gcode
G1 E-1.2 F960
G1 Z5.24 F3300
G1 X162.022 Y59.55
G1 Z5.24
G1 Z4.12
G1 E1.2 F960
M600 B5 E-0.1 L20 R205 T0 U50 X150.00 Y20.00 Z50.00
;Color Change GCode END

*Originally created by @truegret on 11/16/2025* ### 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 11 ### Additional system information Processor AMD Ryzen 5 5600U with Radeon Graphics (2.30 GHz) Installed RAM 16.0 GB (13.9 GB usable) System type 64-bit operating system, x64-based processor ### Printer Creality 10S 300mm x 300mm x 400mm ### How to reproduce 1. Created a multi-body model in Fusion 360 2. Export all bodies in '3MF' file format 3. Import the 3MF file as a new project/plate in Orca 4. Set each body to have a different filament (color) 5. Add 'M600 B5 E-0.1 L20 R210 T0 U50 X150.00 Y20.00 Z50.00' to 'Change filament G-code section 6. Slice plate 7. Export gcode 8. In this case, I am using Simplify-3d v4.1.2, import G-code file to preview and print ### Actual results When color/filament change occurs, M600 B5 E-0.1 L20 R210 T0 U50 X150.00 Y20.00 Z50.00 after new color is in the extruder, the print-head moves to the previous position, touches the model, moves up and advances to the start location of the 'new color'. This occurs on each filament/color change. When this occurs, a small 'zit' of the new color is left on the previous color. ### Expected results Expected/desired is to have the insertion of the 'Printer' -> 'Machine G-code' -> 'Change filament g-code' section/code be after the new color/filament coordinates, and begin printing. This allows for a cleaner print. ### Project file & Debug log uploads Please find the Orca project file, 'CatWithAHat.3mf', and the Fusion 360 multi-body file 'F360_CatWithAHat.3mf' [F360_CatWithAHat.zip](https://github.com/user-attachments/files/23565847/F360_CatWithAHat.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? I believe this is a bug. The 'zit' of the previous color (especially darker new color on previous light color) is annoying and difficult to remove. I have to edit the gcode in a text editor, search for M600 and move the color change code to the first coordinate of the new color. Current (bug code): G1 X187.104 Y69.78 E.03201 ;Color Change GCode START M600 B5 E-0.1 L20 R205 T0 U50 X150.00 Y20.00 Z50.00 ;Color Change GCode END ; stop printing object Assembly id:15 copy 0 ; filament end gcode G1 E-1.2 F960 G1 Z5.24 F3300 G1 X162.022 Y59.55 G1 Z5.24 G1 Z4.12 G1 E1.2 F960 Expected/desired gcode: ;Color Change GCode START G1 X187.104 Y69.78 E.03201 ; stop printing object Assembly id:15 copy 0 ; filament end gcode G1 E-1.2 F960 G1 Z5.24 F3300 G1 X162.022 Y59.55 G1 Z5.24 G1 Z4.12 G1 E1.2 F960 M600 B5 E-0.1 L20 R205 T0 U50 X150.00 Y20.00 Z50.00 ;Color Change GCode END

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Reference: github/OrcaSlicer#1620