I've examined the condensors in detail and while they do come out, when they are in, they are firmly in place.
Hmmm... could it be the filter? I'm printing with a number 4. I suppose it's possible that the edges of the filter (where I handle it) is dirty. I'm not a coal miner (although I DO go home for lunch on occasion ) but I guess it's possible that standard everyday oils could be built up there.