Mesh open after a Boolean subtraction in Rhino8

Rhino Rhino for Windows
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1

Hello everyone,

I have an open mesh problem.
Basically, I import 2 STL (closed mesh) on Rhino and then I do the boolean subtraction of these two meshes. The problem occurs after subtraction where the result is open mesh.
I already tried to fill the holes but it doesn’t work.

Does anyone have any idea where this could come from and how to fix it?

2

Hi -

We’d need to see the 3dm file to be able to offer suggestions.
-wim