Folks serious about rebuildable tanks need to start understanding that 3mm hole + 3mm hole does not equal 6mm hole! Circles don't work that way!!! Pinch point is not the chimney! Draw a picture, this is not real life! Area of a circle is (π * Radius squared)!!! Do the math!
Certainly true, Sully, and a 4.5mm chimney would be plenty to balance with 3mm holes. Moot point though. I find that with Orchid, Silverplay, Goblin, Cthulhu that I have less area around the coils and wicks for the air to move through than than the intake area measured at the deck. I don't think you will notice the benefit of 3mm holes unless you build with narrower coils, which I personally am not particularly interested in.
Wider chimneys brings other qualities though. Just try a chuff cap on a dripper. Sharper sensations, "stingys" and an "unblended" kind of vapor. My favorite is still an 11mm Orchid mod for that reason. However, if I want a mellower vape for certain juice, a narrower chimney seems better. Good to have a range of chimney sizes to choose from.
