Hi,yes, I was just thinking that it looked like a cube with two opposite 
corners cut off. I believe they call this chopping off corners as a 
"truncation":  https://en.wikipedia.org/wiki/Truncation_(geometry)
The only model I know would be David Mitchell's Columbus cube. I have made 
something similar with business cards.  You can adjust the diagrams to truncate 
two corners instead of one.
Third picture from the top:  
David Mitchell's book (Columbus Cube on front cover):  
Diana  (If David is on this list, I love  your work!)

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