I am currently using egg cartons for the first time. I went out and bought new recycled cartons. I didn't bother cutting out the bottoms because the eggs I am incubating are bantams and the cartons are for full sized eggs so there is lots of air flow. It is easier and quicker to turn them this way. I hope that it works better than handturning each egg ...... I'll be finding out in just over two weeks time.