Error = Flow::mm3_per_mm[]produced negative flow. WHAT???
 
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Error = Flow::mm3_per_mm[]produced negative flow. WHAT???  

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miles-h2
(@miles-h2)
Eminent Member
Error = Flow::mm3_per_mm[]produced negative flow. WHAT???

I am getting this error message in Prusa Slicer

Flow::mm3_per_mm[] produced negative flow. Did you set some extrusion width too small?

 

Settings =

.05mm Detail

Generic PLA

Prusa CORE One 0.25 mnozzle

Supports everywhere

Infill: 15% 

 

What can I do? The printer grays out and I can not load the files g code.

Respondido : 30/09/2025 12:47 pm
Neophyl
(@neophyl)
Illustrious Member
RE: Error = Flow::mm3_per_mm[]produced negative flow. WHAT???

This issue has been reported multiple times on the PS github.  It will be one of the settings in your profiles, usually configured as a percentage value.  That percentage will be based on some other value and when that value is altered the percentage is too small and so it throws an error.

If you can zip up your actual problematic project file and attach it here someone can take a look and identify the specific setting for you probably.

Alternatively you can take a look through the github issues and find the setting yourself once you are clued up as to the common causes. 
https://github.com/prusa3d/PrusaSlicer/issues/8447
https://github.com/prusa3d/PrusaSlicer/issues/13429
https://github.com/prusa3d/PrusaSlicer/issues/6422

etc

Its usually easiest to set extrusion widths to absolute values as it avoids all these problems.

Respondido : 30/09/2025 2:57 pm
miles-h2
(@miles-h2)
Eminent Member
Topic starter answered:
RE: Error = Flow::mm3_per_mm[]produced negative flow. WHAT???

This is the file that is causing the error message.

Respondido : 30/09/2025 4:48 pm
miles-h2
(@miles-h2)
Eminent Member
Topic starter answered:
RE: Error = Flow::mm3_per_mm[]produced negative flow. WHAT???

The file

 

Respondido : 30/09/2025 4:51 pm
Neophyl
(@neophyl)
Illustrious Member
RE: Error = Flow::mm3_per_mm[]produced negative flow. WHAT???

Did you zip it up ?  As no file is attached.  It has to be zipped or the forum will silently drop it.

Respondido : 30/09/2025 5:02 pm
miles-h2
(@miles-h2)
Eminent Member
Topic starter answered:
RE: Error = Flow::mm3_per_mm[]produced negative flow. WHAT???

Here is the file zipped

Thanks to all of you for helping.

Respondido : 30/09/2025 6:00 pm
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