Do you have a photo of the bottom side? Or the exit side?
I’m thinking of turning the parts peeling fan into a recirculating filter as I think filters like this (as well as the OEM one) probably don’t have a great single-pass efficiency for VOC’s but something like this as the carbon layer is too thin and you can see through it. But adding this would help overall! I really don’t like the smell of PLA printing.
The air resistance is probably OK considering the fan is designed to work with mode 3.