I don't have a TFV8 but I took a look at the design of it, looks like it is highly likely to dribble juice into the airflow holes so will leak out of the bottom when enough dribble builds up. There is no space between where the cotton will go to the juice holes and the side of the airflow holes - so the cotton will touch the top rim of the airflow holes, when that happens you get a bit of juice dribble down the airflow. You have to build the atomiser so that doesn't happen, which is the fun part.