Just pull the filler out of the carto, and then use it to drip. I've been doing this for months, and I love it. You can put like 10-15 drops of liquid into a filler-removed carto and
vape forever without re-dripping. The "sock" around the coil holds the liquid, and any excess sits in the bottom of the carto. This is currently the only method I am using to
vape. It's fairly simple to remove the filler, just take some tweezers, or something similar, and slowly start working the filler material out. Be very careful not to pull up the center "sock" that surrounds the coil. Depending on how tightly packed the filler material is will determine how easy you get it out. Some of my cartos have the filler material glued to the carto, so for those I scrape down the sides of the carto to loosen it up, then start working the filler material out. Sometimes I get all of it at once, and sometimes I get it out in like 50 pieces, and every now and then I break one. Try it out, I think most people would love it. Just make sure you don't drip down the center hole or else it will leak straight out the bottom (been there and done that).