Product review (1 stars): Dryer design flaw requires constant new filters
Dryer design locates two sharp screws at the base of the filter holder, which are guaranteed to tear the felt rim, so it no longer seals after only a handful of cleanings. I've been through 2 filters now, factory original, and a replacement.

Only solution I can think of is to take the screws out and file them down so they don't extend through the plastic. That should prevent the dryer from tearing the filter seal.