A mill in a closed box full of motors, electronics, lasers and cameras and no ventilation. What could go wrong ?
It is an awkward problem, any hobby mill suitable for apartment (or really any finished space) use is necessarily going to be heavily enclosed - I hardly get to use my Shapeoko until I finish enclosing it because of its ability to project noise and mess. The best model I’ve seen is to pattern the enclosure after traditional VMC type machines to keep air circulation around the critical bits, and the working volume and electronics well separated, but it’s still not ideal.