I couldn't find much info on the spatial aspect they are experimenting with. I was expecting to find different patterns like checkerboard, alternating lines, concentric rings etc and how they impact the co-culture dynamics. There are test prints at [1] and they mention "3D bioprinting handling robot arm that can pour layers of alternating bioink layers" in [2], but layering doesn't take advantage of XY. And maybe it's useful to have temporal control too, like add culture 2 at location 3 at timepoint 4.
[1] https://2023.igem.wiki/rochester/contribution
[2] https://2023.igem.wiki/rochester/implementation