I can’t speak of stacking prints but I am very experienced with the Honeycomb Wall Grid…
Honeycomb Storage Wall Finally Done! - Other topics / Share your prints - Bambu Lab Community Forum
Though I may be entirely incorrect, but I would strongly recommend you don’t try to print these stacked. Of everything (non-action figure related) that I have ever printed, these were the biggest challenge to dial in just right so they looked good and were strong enough to take the potential weight. Besides that, the tolerance is pretty tight and if you are off by too much it is a real pain when printing the attachments.