if i do use a filter, it's always stuffed in after i'm done rolling... i can't roll the weed and filter together and make a good j... as for what to use, do you smoke cigarettes? if so start buying them in boxes, if you buy them in soft packs, the tops of cigarette packs have all kinds of pre-cut roach type things in them.... my favorite to use being the inside lip on the front of the pack... or, start keeping buisness cards in your wallet, those are good too... just rip off a piece as you need it..