It was the o-rings on the ultem piece that slides into the coil head. It was happening to me, but only with the regular nautilus 1.8's, the 0.7's are fine.
Could be the coil making it loose of you're using the open mesh one.
Yeah there's been flooding and chewing issues. Mine has stopped gurgling when filling after I replaced those o-rings.
I looked at both the 0.7 and 1.8 side by side, from the top, the metal is slightly thicker on the 1.8 which was making it impossible to fit the o-rings inside without chewing them and that was with lubricated o-rings.
I only tried the one pack though, so may have been a manufacturing defect with my 1.8s, tolerance issues. I honestly can't remember if that happened with the spare 1.6 coil.
Ok, I'll let you know how I get on.... I have the 1.6 coil in the box and a packet of 1.8's in the cupboard.
yeah those rings are pretty important, I don't see how you would have an air seal without them fully intact and making a seal.
Gimme a couple of weeks and I'll test all the coils I have properly.
Not in my case sadly. I always rinse or wash between coil changes. Coil in the base, few drops down the top, screw I to tank, lube top o-rings and ultem piece, fill tank and put the top cap on.
What I did do to diagnose the issue with the 1.8 was to screw the coil into the base and then try to test fit the ultem section into the coil without the tank section. It would not go in at all, I had to push stupidly hard and it eventually snapped into place, but only because it sliced chunks off the o-rings.
Might be worth you doing that test when you come to use the 1.8, just make sure you lube the o-rings, if you feel any real resistance, stop, for the sake of your o-rings. Luckily there's two lots of spares for this in the bag which is strange, kind of like they knew...