Invalid Mesh

Hi everyone.

I am trying to perform a simple operation in Grasshopper, editing a series of simple meshes imported from Rhino through the Weaverbird plugin in Grasshopper, however what comes out of it is an invalid mesh. Anyone has any idea why this happens?

Any sort of input would be very much appreciated.

Thanks a lot! (26.7 KB)
cell2.3dm (662.7 KB)

It seems there are duplicate mesh faces in your initial mesh input.
If you fix that in rhino from the first place, it should work fine.
And don’t forget to unify mesh normal directions. (128.8 KB)

Amazing! Tried to Select Duplicates in Rhino already and didn’t work. But this way it worked perfectly.

Thanks for the quick answer.