Boolean union failure

Hi, i am trying to union these two poly surfaces, however rhino will not let me, and says the union has failed. As far as i can see there shouldn’t be any reason why it would fail but am unsure why it will not join.
UNION.3dm (4.8 MB)

There is a simple solution to that issue. Extract the two internal surfaces that touch each other, then use “Join”. :slight_smile:

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