How to properly import files?

Hi! I made a staff in blender, d'insectes it and now wanted to add some screws and threads in fusion so i can connect it easily after printing. But I run i to some issues. How do I export file from blender so that when it imported into fusion the bodies keep being separate, the way they were prepared in blender? Whatever i try to export it keeps opening in the fusion as one big mesh. Unless there is a way to add the threads in bambu lab studio?