Initially there was one only one object. I found a company to print it, but there were some problems and they suggested me to separate it and print two objects which can be connect after that. I did’t comply that the object enter into each other.
On operation menu choose “Diffrence”, on object menu choose the other element /roof/, hit the apply button and then everything brokes.
Don’t know how to fix it. I just want to make holes in the roof, so when the two parts are printed I can connect them and make one building. Before using the Boolean modifier recalculated normals, scaled the object. I don’t know what to do. Please help.