Pet rat tunnel and hammock toy

Step 3: Adding support to the body.

cut off the metallic bottom of the can, then if using the large Pringles' can cut  three pieces as shown. or cut the bottoms off the three small cans .... bottom line you have to end up with three rings of the same size.

insert the middle ring into the fabric tube/sleeve that you created, it should be big enough to fit snugly and make a passage through the fabric but not tight enough to squeeze the cardboard.