When did the so called "newer style" come out? I originally ordered my 3S Incubator last November. I measured it, and though it seem to be about 2" wider at one end than the other, it was hard to tell. I am curious as to when this design change took place.
What I did do was to put a different s-biner on the slightly wider (head?) end to help identify it when hanging. Maybe this will make a difference. I have occasionally had a slight draft when the weather was cooler. Don't misunderstand, I love my Incubator. Just curious as to what it is that I have.