The Ultimate Cat Thru-Wall Tunnel

This assembly allows my cat to get into the room that contains the litterbox while depriving our dog of equal access.  It can be adjusted fit the width of typical, interior, non-load bearing walls.  I initially considered putting it through the door, but realized it would be easier to put through a wall and also straight forward to remove it and close the opening in the future.

PLA/0.3 mm layers/2  perimeters/gyroid infill  @ 30%