Having just read this I went and changed my filter.
I have done just under 30 roasts of decaf with it, and I expect Jim (my other half) has easily roasted as many caffeinated batches, so that’s about 60 roasts with the same filter.
I have (hopefully) included photos of the filter.
Can any one take a photo of theirs, when they change it so I can see the difference / or what it should look like, please?