Oil drum w/ locking ring

No hardware or glue is needed, the pins are friction fit into the tight link. The dimensions are pretty tight so you may need to scale the pins up or down a few % depending on your printer. There are a handful of lids so it can be used as a storage box, piggy bank, or trash can. For trash use, there's a hinged print in place lid and a ring to clamp the bag in for retention. To use a pet waste bag as a liner just lay the bag out flat, measure the width of the bag, multiply that by 2, then divide that by Pi, and subtract a few millimeters to give enough space to roll the bag over. Scale the x/y of the drum and parts to match your chosen bag. To assemble the locking ring. slid the lever over the closed hole on the locking ring and put a short pin through it. Take the 2 link pieces and put the side with the standoff towards the lever and put a long pin through the links and the middle hole on the lever. Then put the last long pin through the remaining open hole on the links.