This is the first prototype of active filter.
Assembled with a computer fan and Mi Home connected motion sensor and connected plug, the fan starts to work when my cat enters the toilette, so that odor can be filtered by active carbon filter.
Due to precision of the 3d printer, I had some problem to assembles the cover and the fan. Also , the cover is fixed with the body by a adhesive band.
Improvement to be made in the next version is to design a dedicated electronic circuit to control the fan and have parts printed by a better 3d printer so I can correctly assemble them