I use dividers so I can be sure of the parentage of specific chicks. I use small basket-y type things that I turn upside down, or homemade from hardware cloth. And yes, they do take up space so can only be used if you haven't loaded the incubator to max capacity. And I do find that the chicks from eggs that were not IN a basket will climb on top of the baskets. They will peck at the fan, but fortunately, they don't seem able to get their beaks on the blades. Mine have all been safe so far.
One of my basket dividers is actually a Muchkin brand thingy meant for washing baby bottle parts in a dishwasher. Other things I found were wire organizer baskets meant for silverware drawers. I flip them upside down. It all depends what I find that is large enough to fit eggs, but not too large to hit the dome ceiling of the incuview. I have read where people use mesh lingerie type bags, and I think those sound really cool, and would like to try those sometime.
One of my basket dividers is actually a Muchkin brand thingy meant for washing baby bottle parts in a dishwasher. Other things I found were wire organizer baskets meant for silverware drawers. I flip them upside down. It all depends what I find that is large enough to fit eggs, but not too large to hit the dome ceiling of the incuview. I have read where people use mesh lingerie type bags, and I think those sound really cool, and would like to try those sometime.