Defect: Slicing does not seem to work with MMU, stuck in negative flow message.

[kursatu]

Version

Version of SupserSlicer used goes here, Use About->About SuperSlicer
Latest release

Operating system type + version

What OS are you using (and version)
Windows

3D printer brand / version + firmware version (if known)

What 3D printer brand / version are you printing on, is it a stock model or did you modify the printer, what firmware is running on your printer, version of the firmware #s

Behavior

• Describe the problem
  Slice the attached project file
  Observe the error
  Change one model to use the same extruder.
  The problem goes away
  All width settings are set to 0, changing them does not help to avoid the defect.
  

• Steps needed to reproduce the problem

  • If this is a command-line slicing issue, include the options used

• Expected Results

• Actual Results

  • Screenshots from SuperSlicer preview are preferred

Project File (.3MF) where problem occurs

Upload a SuperSlicer Project File (.3MF) (File -> Save / Save Project)
Defect13.zip

[supermerill]

I computed the wipe tower brim in an unsafe way.
I'll fix that.
in the meantime, you can set a width for the the first layer instead of 0.

[kursatu]

The attached .3mf file did not show the reported problem, pulled and built with the latest sources on github.