ok i was curious about thsi so i made one. i got a piece of bambo about 5 inches long, plugged the bottom and put two incisions crissed crossed over the top of it, so that there was a split down about half the bamboo. i put the bowl in (salt shaker top), then taped electrical tape all the way around to seal the holes. the only thing is the smoke is going to touch the tape before it goes into my mouth...so im wondering if thats like toxic or anything. it will never be under direct flame but might get warm, however, since its electrical tape i was thinking it might not emit anything btu fuck i duno im really high so if anyone could explain thanks,.