one tube, one rat, one ratstop in two pieces - you may use only the front part or glue it with the mesh part together (with Prusament PC it was pressfit style).
:-) if you want to test the strenght of the rat teeth (and your filament), you could put some sweets or food into the cage.
have a ratless day!
The author remixed this model.
used the nice patterns from @Hendl and the idea from @XDEnte to build the ratstopper