Unable to unweld

I have lots of hexagonal extrusions that I created using Grasshopper. I’m enclosing only some of them. Their edges somehow don’t seem to get unwelded even after using the unweld command in Rhino. I have marked them with arrow.

I have also shown a BREP which was made using extrusion of a hexagonal polyline and another geometry which is that BREP converted to a mesh using ‘mesh’ command in Rhino.

Why am I not able to unweld these meshes?

unweld mesh question.3dm (386.5 KB)

Hello- make sure ModifyNormals= Yes.


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Thanks a ton! That worked well!