Yes an empty cart is best for dripping. No need to have anything in there that will inhibit air flow.When ya'll speak of a cart you're talking of the removable cartridge that has the fiber in it right? I have removed mine from the 510 and it seems to work fine. Maybe I'm expressing this wrong. I guess with the 510 I should say an empty cart, i.e. no fiber. There's no way on any of these e-cigs I've got (801, 510 and RN4081) I'd not have a cart., I just have empty carts. Is that basically what ya'll are saying, empty carts?
Sigh, still learning the lingo I guess.
With the 901 the atomizer does not get so hot and it can be used without any cart at all.
DW