Models: I personally own 2 different 501s, 901, 401 and 808s. I am having trouble with flavor in my carts on the 3-pieces. Filling: I wanted to see what different people are using as filler. I have only tried using an analog filter, that seems to work great at first, but is very fragile to say the least. I was going to try to buy some of the blue foam, but the pet stores in my area do not carry it so I'll have to try a Petsmart or something. I have not tried the pyramid tea bags, so I look forward to hearing about those and where to buy locally hopefully. Any other suggestions of filling that I have not listed please let me know. Cleaning Filling: I do wash all filling before I use it in boiling water, and I have also tried cleaning with Crest. Filling methods: I have tried the paper clip trick, but it does not work for me as good as others claim it does. I think I must be doing something wrong. I have not tried the straw method yet. I keep searching around the house for something to use. What does anybody think about a plastic q-tip tube? Will it burn up? Flavor: I use methol personally. I tried an experiment where I used the same flavor in all my carts and cartomizers and I keep getting inconsistent flavors. Some literally taste like sucking on plastic. I have perfected using my cartomizers, but even some times if the cartomizer is a blank or cleaned out flavor cart, the taste varies. This leads me to believe that it is all about the filling material. I gladly welcome all opinions no matter if your a newbie or veteran.