I think what makes the “Bottle Mod” work so well is the same thing that causes an E2 carto not to work sometimes. Surface Tension of the e-Juice in the juice reserve area.
When I look at the Bottle Mod, I see no restrictions on the juice to freely flow to the cup slots. So at this point, the wick can work to it’s maximum efficiency. Even if the wick has become flattened, because it is single strands, the e-Juice can slosh around in the area where the wick enters the cup via the slot.
But in an E2 carto, there is a very small gap between the cup and the inside of the carto body. This small gap actually inhibits the liquid flow of the e-Juice from making contact with the outside of the cup at the slots. To see this, half fill an E2 carto with 50% VG e-Juices and lay it on its side with no seals. The juice doesn’t flow out of the carto. The surface tension of the juice is enough to stop it from flowing around the cup and out of the carto.
So the amount of juice that can be vaporized by the coil for any given hit is diminished to the amount of juice Inside the cup on the wick. The wick inside the cup runs dry, the coil wire cannot exchange heat energy fast enough to produce vapor, the coils wire gets too hot and burn gunk / juice causing a bad taste. The end result is members search the ECF and YouTube to figure out how to do a PTB mod and save their precious cartos.
This is what first gave me the idea of using a filler medium to bring more juice, thru capillary action, to the slot area. The PTB works because it assists the e-juice in reaching cup slot area. The smooth walls inside the carto actually work against the natural ability for a fluid to “climb”.
Unfortunately, the design parameters of the E2 seem to be that the carto O.D. was the same size atty. This left a very small gap between the cup and the I.D. of the carto. To make thing worse, a cup seal was needed to keep the cup from flopping around.
What is most promising is that Bottle Mod doesn’t seem to have many downsides verses benefits. Being able to see the amount of juice is a huge benefit. Refilling can also be done a number of different ways depending on the configuration of the bottle and the mouth piece.
BTW – How are members removing the carto body from the inner workings of the cart so cleanly? My attempts have left the connector somewhat mangled.
