The goal I am trying to reach is to create circles on the inner side of the end of the big tube. So I created a plane and want to intersact it. But after I do intersact it and delete the face of rectangle I see that the circle has some gaps. Why is it? How to fix it?
Ive never experienced this issue but why don’t you just copy the inner line of the tube and move it to the area you need? Seems like it would take less time than intersecting faces.
turn on the hidden Geometry. You can see there will be lots of very short edges where the plane crosses the softened edges. These edges are going to be so short, SketchUp won’t fill them in.
You could work with the model scaled up by a factor of 100 or 1000 and get around this problem. It would be best to start with a cleaner model.