any ideas/preferences for design, just trying to feel out what other people like, i personally like short and fat ones(i tried to think of another way to word that without opening myself up for jokes but couldn't). also, as far as genesis air hole size goes has anyone tried substituting drilling the air hole with different inside diameter drip tips? just a thought
The main thing when it comes to design is just make sure it's machined with close enough tolerances that it doesn't wiggle.
Wiggly drip tips are an annoyance and make an otherwise solid atomizer feel flimsy.
Personally, I prefer a bit longer drip tips, because the chances of getting hot juice spit into your mouth by the coil is greatly reduced. Plus it feels weird to have your atomizer so close to your face, at least to me, with a shortie tip.
You'll find that drip tips are as much about personal preference as juice flavors, so your best bet is to simply offer a variety of sizes in each style, if you have that capability (such as shortie, standard, and long tip).
Good luck, designing machined parts is a lot of fun.