I have three filters that I rotate. After about 10-15 roasts I just rinse it in hot cafiza solution to get out all the coffee oils and dirt. I rinse very well and let dry. They last through MANY cycles of this cleaning.
On another note: I'm having increasing trouble with three of the buttons on my control panel. The power, eject and heat/fan lowering buttons. I can press them 10-20 times in different ways before I get a response. It's a pain and I'm afraid I may need to replace the panel (~$120). I just got an email form Michael and he had not heard this but suggested possibly cleaning contacts with alcohol (I assume from the inside). Any suggestions from this group?