Brought the schools incubator home and have been making it ready for a class project in a couple of months. The 2005 Marsh Automatic Incubator model RX-MAS comes with an auto turner tray and the tray chosen by a former instructor selected a large hen egg size. If you notice the plastic eggs shells; they are holding my bantam eggs that would otherwise fall through the tray. Once the tray turner rotated several of the small eggs lodged the turner. Luckily moving the eggs in the center row away from the bottom stand construction fixed my egg jam.