Weird bug found - PrusaSlicer 2.9.2, ColorPicker (MultiMaterial Painting tool) shows colors wrong
 
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Weird bug found - PrusaSlicer 2.9.2, ColorPicker (MultiMaterial Painting tool) shows colors wrong  

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ReeDoet3D
(@reedoet3d)
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Weird bug found - PrusaSlicer 2.9.2, ColorPicker (MultiMaterial Painting tool) shows colors wrong

I noticed this today;

Wrong colors shown in color picker

As you can see; the color for First color should be white, it is yellow. At first I thought a setting imported from a 3MF messed it up, but the manual clearly states;

Excerpt of manual

So this should go away with a restart. Well, it didn't.

Funny thing is; changing filament color, also changes the color in the dropdown, but always with Yellow mixed in.

So I went on an investigation, and finally ended up with PrusaSlicer.ini (in ~/Library/Application Support/PrusaSlicer, in my case as I am on a mac)

Not a single line seemed appropriate. I quit PrusaSlicer, moved the file away, and restarted PrusaSlicer. Apart from a few crashes and a setup wizard, the problem was gone, so it IS stored in the ini file. ... yet... nothing to be seen.

I then removed sections, replaced sections from backup and finally found the line responsible.

The culprit

Removing the font size line solved the problem!

Now, I really do NOT see a reason why a font-size line in an INI file would cause the color picker to be wrong, so I can only conclude this to be a bug.

I will keep my backup of the PrusaSlicer folder with this issue, it is available for Prusa Research upon request.

I hope this post helps anyone with same problem.

Posted : 22/08/2025 11:21 am
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