Since you've had no other replies, I thought that I would just put in what little I know. I've tried cartomizers but prefer atty/carts. Anyway, I don't think it is generally worth the effort to even try to replace the material. Cartos cost so little because they are not meant to last very long, and are meant to be disposable. But easy to transport/use. What little I've done with trying to disassemble one, the stuffing is at least partially wrapped around the atomizer and/or wires. I doubt that it would really be worth it to try. Just keep extras on hand.