I think i got it. It's the mesh size. But not the face count. It's the mesh size in units. Seems that i hit a limit here.

It compiles fine with a scale of 1 (has around a size of 90x90x9 then). But fails as described with a scale of 100 (has around a size of 9000x9000x900 then).

Hmm, but i need it this big. That's not fair