Mic tutorial - unable to subtract / cut grooves

Hi, I manage to create the two-halves and shelled them. Just when I try to cut all the grooves, I can’t. No “done” button after selecting the bodies. They clearly intersect each other.

Have I done sth stupid here?


At first glance it looks like the body you want to subtract from is superimposed on another body. Hide Body 01(2) and see if there is another body there.

Got it!! I think one of the shell had some issue. I dubbed the good one over and it is done!