Still with some prelimary parts (printer still prints on it's own housing), but already fully functional with inner lamps, HEPA (14) and activated carbon filtered air.

Still with some prelimary parts (printer still prints on it's own housing), but already fully functional with inner lamps, HEPA (14) and activated carbon filtered air.

Sweet! :D
This is almost exactly what I'm planning to build. Acrylic enclosure with corner fixtures, and, for ventillation, a 120 or 140mm Noctua fan running the air through carbon and HEPA filters.
Nice Job! It looks good! :D
That looks great! Do you have any details about the parts you used and mount for your filter? Is the suction from the fan enough to not need a bottom enclosure?
The filter box is from another design I haven't released now (would require some modifications before). Everything except the filters (of course) is just part of my design and 3D printed. The HEPA H14 filter is from a Nilfisk vaccum cleaner wich is available on Amazon for 13 Euros.
Enclosing the printer completely is not a good idea! The Cetus extruder does not like higher ambient temps (will stop extruding) and a completely enclosed printer will heat up such an enclosure quick (even quicker if the heated bed is used). Higher chamber temps would need a modification of the extruder (much more cooling of the cold end).
Another point you mentioned: The suction. No I think the suction with the first fan was not enough, switched to a much stronger fan now. And if there is so much suction needed (wich I think it is), how could this work with a completely enclosed printer? That's why the bottom is open (creates a chimney style air vent with the filter box). Another point is the easy access to the printer (the new design has a magnetic front that can be detached and the printer pulled out).
I will finally test the filter box with special smoke/powder visually (don't have a particle tester :-)
Right now there is zero smell in the room, only a bit noticeable with the nose directly above the fan.
New design version: https://www.cetus3d.com/index.php?r=moshop/info&id=2325
Nice work!