Extrusion width parametr ignorened in generated gcode

[gabrkova]

Description of the bug

Tried to make first layer wider. Generated 2 gcode files from Prusa Slicer with different parametr of extrusion width for first layer (from 0,5 changed to 0,55).

Generated gcode files were the same, no wider first layer was in gcode.

Project file & How to reproduce

Model 5 Dil C.zip

1. generate gcode file with parameter 0.5
2. chang the value of parametr extrusion width for first layer
3. generate gcode file with parameter 0.55
4. comapre the 2 gcode files

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

PrusaSlicer-2.8.0+win64-202406270929

Operating system

Windows 11 64 bit

Printer model

Prusa MINI+

[neophyl]

That is because you are using Arachne as the slicing choice. Arachne will dynamically adjust extrusion widths to suit itself. In effect you are giving up control to the algorithm. By the time its adjusted from the 2 starting defined widths what it decides to use basically becomes the same. I tried 0.6 width and its the same. I had to go to 0.7 to start seeing differences.

If you change the slicing to Classic and do your 2 exports with different extrusion widths and do a compare you will see differences on the first layer.