Infill problem

Software
1

Can some one tell me why my Creality print refuses to make infill inside the central column
in this object?
what am i doing wrong?

centrale
centrale1920×1032 180 KB

this is the .stl can someone try pls?
cappello.stl (1,2 MB)
Thank you in advance.

p.s. is made with Creality Hyper PLA blue

2

I’ve sliced it with Cura, and as you can see the infill is present

centrale_cura
centrale_cura1920×1032 251 KB

3

ok i’ve got it, was only not visualized in preview, my fault sorry

4

nice post well said