I still don't quite understand sorry. How would I create a hollow block? All my imported geometry are solid blocks. I tried to use the block tool in icepak with a 2 r network by selecting the top and bottom face of the block. That gave me two Rs in the network setup but then complained about the double sided meshing again. Sorry, I'm having trouble understanding how to set this up. Even if I make a hollow block in CAD the inside will still have a face?
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