The airfilter consists of two 80mm fans, converted to a 100mm output on which I put a hose to the outside. In this case it will go to the attic.

I use an eSun dryer box for my filament while printing. So I had to create a filament throughput. For this a use a bowden tube internal and external to the dryer box.

On the original eSun eBox there is no humidity sensor. But I found a nice one on thingiverse. So the external bowdentube goes to the eBox with internal humidity sensor.