Does enlarging the Cup Seal ID or the O-Ring ID cure the Burnt Taste because it somehow improves wicking? Or is it because less vapor is in contact with the Black Rubber material.
Some have mentioned in other posts that the Black Cup Seals/O-Rings/Mouth Pieces have a Funky Rubber taste. Kinda like chewing on a old 185/70 Goodyear tire.
The primary advantage of increasing the O-ring ID (or cup seal ID) is indeed to move as much of the rubber/silicone material as far away from the coil as possible. By cutting out the inner lip of either you're eliminating any material from resting inside the cup, and therefore near or even on the coil. (I've had some where the coil was off-center and near a slot, which brought it in direct contact with that inner O-ring lip).
However, a minor secondary advantage is increased convection. With the larger hole comes the ability to remove more heat from the coil, reducing buildup in the cup allowing the coil to release more heat to the surrounding air, resulting in a slightly warmer vape. (The coil can't heat the surrounding air if the surrounding air is the same temperature as the coil; being able to move heat allows the coil to do its job better.)
The reason I don't use the cup seal is that even though you can still do the donut mod on it, I was never able to solve the wicking issues even by increasing the size of the slots and lifting the seal up further. (Although I never tried that in conjunction with the donut mod applied to the cup seal. Maybe that's something I should try.) Using the inverted O-ring solved the wick pinching issues and allowed a very free flow of juice to the coil -- but still prevented flooding, as long as the wicks are fluffed.
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