Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:6078686.
This is a tunnel for pets (cats) to travel between inner walls of your home. The tube can be scaled to be the exact depth of the wall. Then you print 2 covers to place on each end.
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When scaling the tube, only scale in the one direction. the width and height are matched with the cover. The cover is meant to fit inside of the tube, giving it a clean look.
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The tube has a crosshair on one end. This aids with aligning the hole on the opposite side. After the first hole is created, the tube can be inserted into the wall and crosshairs against the opposite wall. Use a drill or nail to poke a hole in the wall for placement on the other side. From the other side you have the center hole and again use the tube to trace the hole.