I'm actually considering a horizontal single coil between the posts. I tried it in my velocity rda and it works quite well but I know the deck is probably smaller in the aromamizerThere is plenty of room on the velocity deck for a vert between the posts.
I have one in the one on my xcube ii. 3mm id is a little tight of a fit, especially if you're using wire that likes to deform, but still manageable. 2.5mm id fits great.
The airflow becomes more important if you're building vert between the posts. You definitely want air holes aiming directly at the coil for it.
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