I have created a twist drill with cooling chanels and flute. Around this (part 1) I have crated a hole (part 2). The hole's opening is closed, so that the drill is completely surrounded by the hole. The drill is a little bigger in diameter than the hole and also a little longer than the hole, so that there are intersections everywhere.

I definitely have two closed "empty" volumes between the drill and the hole (the cooling channels an the flutes, which are connected as pairs. One channel with one flute).

But when I run the "check geometry" it says: The fluid volume is 0 m^3, which is definitely wrong. It doe's not produce any errors or hints.

What could be the reason?