Cutting for two parts imported model of human skull (very complicated)

[Bartosz1 (Bartosz)]

Hi!
I struggle for a long time with one issue.
I make medical models. After rendering human skull which is very complicated model I imported this model to blender. The size and amount of triangles was incredible. I used multiple options to “open” the model by cutting into 2 parts top and bottom of the skull - for 3D printing to be able to look inside the skull. I was unable to cut it, and achive flat surface of the skull. Every time the connecting surface was irregular like saw. Is it possible, to cut it in a perfect flat surface?
Thanks

[oo_1942 (Kim)]

Cut it with a Boolean modifier.
Cut along the normal direction of the face in the plane.

[Okidoki]

Welcome …

@Bartosz1

I used multiple options to “open” the model by cutting into 2 parts top and bottom of the skull…
I was unable to cut it…

So… what did you do ??

Ther is the Bisect tool … with proper option you get: