Diamond cell structure

A few days ago, I didn't know what a Diamond cell is all about, and I didn't even know the look of it. The question behind was asked in the German Inventor forum: https://forums.autodesk.com/t5/inventor-deutsch/wurfel-als-hilfsebene/td-p/11659252 In the end I came up with the attached geometry. If End-of-Part in Inventor (2023) is left as actual, it only shows a single cell. If EOP is moved down, it shows a small pattern of cells. The STEP file only shows the single cell, but patterning is easy now along the edges of the cube.