Well, I guess you're not a real vaper till you've invented a cart mod, are you? 
This is how it happened: my 5 volt box mod with an 801 atty was burning through the usual white polyester filler / batting too fast, and it was annoying me - every 3 or 4 days I'd have to chuck it and refill the cart. So one night I started looking around for something better.
Couldn't get any of that blue filler stuff because the aquarium shop wasn't open - and anyway there was no aquarium shop. I had no straws, no plastic disc, no nylon teabag. But what I did have was a packet of rollup cigarette filters, for roll-your-own cigs - I'd cut down on the analogs by going on to rollups, because they have about half the amount of tobacco and fewer of the nasty chemicals.
It seemed like a cigarette filter might work, so I tried it. The filter is used along with a small piece of standard white filler - maybe a third of the usual amount for a complete cartridge fill - to jam it at the top of the cart.
The rollup filter is maybe three-quarters of the diameter of the 801 cart inside, and half the depth, so you need something to jam it at the top of the cart. Use a piece of standard filler and jam it alongside, slightly below the level of the top of the filter - maybe halfway down.
This creates a plug at the top of the cart. There is a gap down the side of the filter, which allows quick filling even with a dropper. It wicks OK but the first day it's a bit slow, resulting in a hot vape. For the Mark 2 version, I pushed a hole through the centre of the filter with a small electrical screwdriver. This helps the liquid to wick through for a day or two till the filter gets 'run in' and wicks fast. The hole eventually closes up but by then the filter is wicking fine.
Make sure to leave the filter protruding well out of the top of the cart. The atomizer bridge (the shield over the top of the coil) pushes the filter back down to exactly the right position. The filter does not burn at all, until you run low on liquid, when as usual you get a burnt taste that lets you know it's time to refill. And as it happens, the burn taste of these filters is preferable to the normal vile melted plastic taste you get with the standard filler.
This was done on an 801 whistle-tip cartridge but should work on others. A 510 cart is narrower, so you might have to cut something off the diameter of the rollup filter, as you need a gap down the side for quick filling with a dropper and fast wicking.
Step by step:
1. Get a rollup filter and some standard white batting / filler.
2. Push a hole lengthwise through the roll-your-own filter with an electrical screwdriver of very small size. A hole pushed through with a straightened paperclip end is not big enough; and with a screwdriver that's too big, you've wrecked it. The resulting hole should be clearly open and about 2mm diameter.
3. Take a small piece of standard white filler and place in the open neck of the cartridge. Place the filter against it and press down. The batting should be well below the top of the filter, and jam it in place nicely. Leave the filter well proud (ie sticking out).
4. Press the cart into the atty and see how it fits. Pull back out, and check. The filter should now be pushed down to about 1mm below the cart lip.
5. Fill with e-liquid, using a dropper is OK, although on Day 1 a syringe will be quicker as the filter isn't wicking too well yet.
Give it a go. I've been using mine over a week now and it's the longest I've ever gone without a filler change on my 5-volt box mod 801 carts. The filter doesn't burn even when in hard contact with the atty bridge. There is no burnt taste until you run out of juice. Day 1 can give a hot vape as the filter isn't wicking fast enough yet, but Day 2 onward is just fine.
See the diagram for an idea of what it looks like. You can see the polyester filler jamming the rollup filter in, in the drawing.
I've no idea if the rollup filter cart mod will work on a standard ecig, it works fine on a 5 volt device but maybe only because it's more powerful.
My apologies if someone already posted this, I haven't seen it before.
This is how it happened: my 5 volt box mod with an 801 atty was burning through the usual white polyester filler / batting too fast, and it was annoying me - every 3 or 4 days I'd have to chuck it and refill the cart. So one night I started looking around for something better.
Couldn't get any of that blue filler stuff because the aquarium shop wasn't open - and anyway there was no aquarium shop. I had no straws, no plastic disc, no nylon teabag. But what I did have was a packet of rollup cigarette filters, for roll-your-own cigs - I'd cut down on the analogs by going on to rollups, because they have about half the amount of tobacco and fewer of the nasty chemicals.
It seemed like a cigarette filter might work, so I tried it. The filter is used along with a small piece of standard white filler - maybe a third of the usual amount for a complete cartridge fill - to jam it at the top of the cart.
The rollup filter is maybe three-quarters of the diameter of the 801 cart inside, and half the depth, so you need something to jam it at the top of the cart. Use a piece of standard filler and jam it alongside, slightly below the level of the top of the filter - maybe halfway down.
This creates a plug at the top of the cart. There is a gap down the side of the filter, which allows quick filling even with a dropper. It wicks OK but the first day it's a bit slow, resulting in a hot vape. For the Mark 2 version, I pushed a hole through the centre of the filter with a small electrical screwdriver. This helps the liquid to wick through for a day or two till the filter gets 'run in' and wicks fast. The hole eventually closes up but by then the filter is wicking fine.
Make sure to leave the filter protruding well out of the top of the cart. The atomizer bridge (the shield over the top of the coil) pushes the filter back down to exactly the right position. The filter does not burn at all, until you run low on liquid, when as usual you get a burnt taste that lets you know it's time to refill. And as it happens, the burn taste of these filters is preferable to the normal vile melted plastic taste you get with the standard filler.
This was done on an 801 whistle-tip cartridge but should work on others. A 510 cart is narrower, so you might have to cut something off the diameter of the rollup filter, as you need a gap down the side for quick filling with a dropper and fast wicking.
Step by step:
1. Get a rollup filter and some standard white batting / filler.
2. Push a hole lengthwise through the roll-your-own filter with an electrical screwdriver of very small size. A hole pushed through with a straightened paperclip end is not big enough; and with a screwdriver that's too big, you've wrecked it. The resulting hole should be clearly open and about 2mm diameter.
3. Take a small piece of standard white filler and place in the open neck of the cartridge. Place the filter against it and press down. The batting should be well below the top of the filter, and jam it in place nicely. Leave the filter well proud (ie sticking out).
4. Press the cart into the atty and see how it fits. Pull back out, and check. The filter should now be pushed down to about 1mm below the cart lip.
5. Fill with e-liquid, using a dropper is OK, although on Day 1 a syringe will be quicker as the filter isn't wicking too well yet.
Give it a go. I've been using mine over a week now and it's the longest I've ever gone without a filler change on my 5-volt box mod 801 carts. The filter doesn't burn even when in hard contact with the atty bridge. There is no burnt taste until you run out of juice. Day 1 can give a hot vape as the filter isn't wicking fast enough yet, but Day 2 onward is just fine.
See the diagram for an idea of what it looks like. You can see the polyester filler jamming the rollup filter in, in the drawing.
I've no idea if the rollup filter cart mod will work on a standard ecig, it works fine on a 5 volt device but maybe only because it's more powerful.
My apologies if someone already posted this, I haven't seen it before.
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