[Different infills in one model]

Problem with extra shell wall I resolve by add parameter "Wall line count = 0". And with Cubic infill pattern it's great:

 

But when I used Cubic Subdivision :

CFFFP_Puzzle.3mf

[Different infills in one model]

9 minutes ago, Smithy said:

" It seems your model is not really solid everywhere "

 

No, model is correct. When I have model alone, everything is correct. With another model is result the same .
When I change infill type to GRID, infill is correct, but shell wall between inner walls remains.

I try this with default settings and result is the same.

[Different infills in one model]

Hi,I don't know, what I doing wrong. I just want different infill in one part of object. There are two problems. First is shell wall between inner walls. Second is empty infill above correct infill. Any tips?