Hello. This is my first forum please, so excuse me, if this has been discussed to death. I just couldn't come up with a search term, that narrowed it down, to where i could find an answer to my question. I have gathered all the electronics, and building materials, to start building my fully automatic cabinet incubator with room for about 90-100 eggs. But i am a little confused as to how people manage the mess and dander fallout from the other eggs, when using an incubator with egg trays in multiple layers? I see the commercial versions have trays in the bottom, for hatching chicks, but the logistics of that eludes me. How can let's say 3 layers of eggs, on 3 egg turning trays, that pretty much uses the same area as the footprint of the machine times 3, fit into the bottom of the machine? Do they have stacks of incubator trays in the bottom? Will that not hurt the temperature distribution? I could see it being possible to take out the egg trays that would sit on wire mesh on 3 different tilting shelves, and switch them for something with a solid bottom, and mesh sides, on the 18th day, but it seem a little clumsy. Right now i'm leaning towards building a separate hatchery incubator. The hatching process is messy, and keeping that in a totally different machine actually seems easier right now, than having to build a machine that can do it all. Or am i over thinking it? One other advantage i could see with a separate hatcher, would be that it would be possible to add eggs after a batch has been started, since the different moisture levels would also be kept separate, and i wouldn't have to deal with one set having to be turned, and another not. Yes - building an extra unit is more work, but with the price of pretty good temperature, and humidity controllers, it would cost a lot. But if you think it's totally overkill to have 2 machines, could you please share how you handle the hatching process, with a multiple layer machine. Hope my question makes sense. English is not my first language, so conveying my meaning concisely is proving a challenge for me . Thank you.