I'm bumping this as I have not printed much since this previous post, but today I'm doing a print with lots of holes and some of them (not all, strangely enough) have this issue even though they are not near the outer perimeter (or other holes) at all. See sample below. As you can see the individual...
I've made a little experiment and can confirm your tip about increasing the overlap. However, this seems like a stupid workaround for a problem based in poor "pathfinding" in the software. Below are screenshots of the printing preview using different values for infill overlap, from 10% up ...
It's not really the infills though, it's the top (and bottom) layers. So I think more infill overlap wouldn't help. Also, it's already at 25% if I recall correctly (currently at work so can't check).
See picture below. (Sorry about the quality but the issue is still visible.) holes1.jpg The part is 6 mm and the hole is Ø3 mm which means there is 1.5 mm on each side of the hole that should be filled. Seems like it shouldn't be a problem but apparently it is. Extrusion width is 0.5 mm. I'm guessin...