The author remixed this model.
This Model (3mf file) is a ready-to-print assembly of the original 2-part model. Just import it into your slicer and send it right over to the printer. All necessary parameters for a perfect grid and infill should be set. You might need to adjust the scaling a little depending on your nozzle. I just used a 0.4mm and it worked perfectly.
Thanks to the original author for these amazing looking cookies though! PogChamp!