I am pretty new to Sketchup and just using the online version because my model is not complex. This is my model.
I export to .stl. Then I check my model and repair if needed using this website. https://3d-print.jomatik.de/en/index.php#SetFront
When I plug it in it says it needs repair, which has happened to me before . I repair it but then my files looks like this. (I guess I will post the picture as a comment since it won’t let me add 2 pictures here because I am new)
The top section taken out for some reason. Does anyone know why this is happening or a way around it?