Not be able to make a boleana

I can not make boleana among the red and the green part. I here attach
carab…3dm (6.9 MB)
the rhino design. If anyone can help I thank him in advance. Mirco

Your red part has internal surfaces at these locations

Explode it, delete these 8 surfaces (2 at each location), and re-join it. This produces a closed polysurface that will successfully boolean union with your green part.

-Kevin

thank you Kevin, it worked!!! :sweat_smile: