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Okay so in sketchup - sketchup lets you create non-solids. And in the STL file sketchup is telling cura which sides of the surfaces face air and which side faces plastic. You want to see *only* what faces. But in the image below where I zoomed in on one of your images - you can see the inside of that cylinder is blueish gray? Right click on that and select "reverse faces" and it will turn white indicating that the visible side of that cylinder is facing air.
Look for other surfaces like that. That's the only one in my tiny clip but I see the inside base is blue in one box and the taller box with the two vertical holes has the center (of 3 faces) as blue. Fix all of those. Here are more hints - it looks like a lot to read but it's pretty straight forward and quick reading and very informative:
Also go to "preview" mode (top center) and on the left switch from "layer view" to "xray view" and if you see any red in xray view you either have an extra interior surface or a missing surface. This is discussed also in the link above.
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Okay so in sketchup - sketchup lets you create non-solids. And in the STL file sketchup is telling cura which sides of the surfaces face air and which side faces plastic. You want to see *only* what faces. But in the image below where I zoomed in on one of your images - you can see the inside of that cylinder is blueish gray? Right click on that and select "reverse faces" and it will turn white indicating that the visible side of that cylinder is facing air.
Look for other surfaces like that. That's the only one in my tiny clip but I see the inside base is blue in one box and the taller box with the two vertical holes has the center (of 3 faces) as blue. Fix all of those. Here are more hints - it looks like a lot to read but it's pretty straight forward and quick reading and very informative:
https://i.materialise.com/blog/3d-printing-with-sketchup/
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