The article goes out of the way to talk about the tubular structure that is bisected by a solid structure. And yet the cube has only tubes, and where the tubes are unfinished at the edges, the tubes appear to have an internal bisection.

One of the fun things is that you absolutely could not injection mold this :-).

Generating it as an infill would be interesting. I'm generating some cubes with CAD (since that is easy to do) that printed at 100% infill will (aka no guessing on the slicer's part) will let me try their cube structure, the paper's suggested structure, and others. I'm going to guess they patented it (could be wrong but most university research seems to go for patents) so it might not be possible? to put it into an infill library without dealing with that.

This pattern looks like it's designed for an isotropic material. Sintered metal printers ought to produce solid metal. Extrusion printers, though, tend to have weaker inter-layer bonds than bonds within the layer. So this may not work as well in PLA. Might need a pattern that compensates for the weaker inter-layer bonds.

Edit: it was probably about https://www.science.org/content/article/3d-printing-doubles-...

It looks like there might be enough difference in relevant scale that both techniques could be applied.