Ian thinks you mean larger voids. I thought you meant pinhole voids. Best to post a picture.
Everytime cura crosses a wall boundary in your STL it alternates fill versus hollow - that is what ian is talking about.
pinhole voids can be underextrusion or loose belts - posting a picture will help diagnose.
wall thickness determines how many times cura loops around your walls. .4mm and it does it once. .8mm and it does it twice and so on. If infill is 100% .4mm is usually enough although .8mm might possibly make for nicer looking walls. Maybe. Or maybe worse. Wall thickness affects inner walls and exterior walls. When you slice the model in a 2D plane then it thinks about walls. Inside walls are also called "loops" and outside walls "perimeters". If you have two passes or more passes on a wall e.g. .8mm, I believe the inner loop is considered a "perimeter" for other cura settings.
So wall thicknesses countour to your part. Infill is always on the diagonal path. Not a lot of difference but it is a difference.
sounds like there could be a problem with your actual 3d model !
If you have seperate elements intersecting one another in your model, and try and print. you will get zero space intersections and they wont be printed.
So my best suggestion would be to go back into your model, choose the intersection elements, use a Bolean join objects command and then do a fresh STL export.
That can help a lot !
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