See this example, two identical objects, identical settings, the one on the left is single color, the one on the right is 4-colors. I really don’t want that black infill, oh well 
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The paint tool is rather tricky to implement in the slicer. I dare say that is part of the issue.
Maybe playing with the number of walls will allow you to hide the infill?
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Thanks, an interesting suggestion. I tried that, but doesn’t seem to help.
I can see how with painted surfaces this might be trickier.
I checked OrcaSlicer, couldn’t find any equivalent functionality.
Of course, forcing a particular infill is also a tricky option for multi color prints - what if a particular layer doesn’t have that color, should we force a color change?
For me, the most flexible solution would be to specify the priority list of filaments for infill, where I could say “use the light one first, then the dark one”, and the slicer would choose the first one from that list that is present in the layer.
I agree. Although it may make sense to prevent bleed through by using a white sparse and solid infill filament.
As a last resort, I did struggly somewhat with a print’s bleed through a while ago. I was able to overcome it by using the ball paint tool’s depth penetration but it was really frustrating painting with that…
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Thanks for all the hints! That’s actually another possible solution - if we could “paint” the insides (we can’t today), then we could mark which areas we want with what infill.
But I doubt it’s high on Bambu’s list 
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