PrusaSlicer bug: 100% infill uses wrong extruder with multimaterial printing while 99% infill works fine?
 
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PrusaSlicer bug: 100% infill uses wrong extruder with multimaterial printing while 99% infill works fine?  

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MixMasterMike
(@mixmastermike)
Eminent Member
PrusaSlicer bug: 100% infill uses wrong extruder with multimaterial printing while 99% infill works fine?

I am using PrusaSlicer 2.9.4 which is the current version.

Both objects are the same, all settings are the same. The white part is supposed to be translucent and therefore printed with 1 perimeter, 0 top & bottom layers, and aligned rectalinear infill to make it as translucent as possible using transparent or white filament. 

BUG?

But for some reason the slicer wants to print the uppermost layer on some of these little windows with the other wrong filament, despite me having selected something else for this entire object. This strange bug occurs only when I set the infill to 100%, but when I make it 99%, everything seems to be fine (despite the infill not being at 100% of course).

What is going on here? How can I fix this?

Posted : 02/01/2026 3:36 pm
Diem
 Diem
(@diem)
Illustrious Member

Please save your project as a .3mf file

Files > Save Project as

Zip the .3mf and post it here. It will contain both your part and your settings for us to diagnose.

Cheerio,

Posted : 02/01/2026 5:14 pm
1 people liked
MixMasterMike
(@mixmastermike)
Eminent Member
Topic starter answered:
RE:

here you go. I set one side panel on both side panel build plates to 99% and one to 100%. For the top panel 100% works.

This post was modified 18 hours ago 3 times by MixMasterMike
Posted : 02/01/2026 5:31 pm
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