I printed using petg with no supports 10% infill 3 walls prints on its side you can fit 3 on a plate if you rotate one 180 and orientate them right.  There stackable and each one holds 12 eggs.  I have a 9 egg version that will fit on the a1 mini if you want that one i can upload it as well.  If you like it please share a boost.  Thanks!!