Kitchen Garbage Can Connectors. Our cardboard box was beginning to fade. I found this .3 mm board (coated with plastic?) that is sturdy. I didn't have complete sheets so I have extra connectors for the extra sections. I'm not sure what the board is called - but can probably be gotten online or through craft store. Uses only one connector shape for all positions. The connectors are just press fitted on. Working fine the last couple of months but they could be glued in if necessary.

Design: Yes, only one connector for the whole thing. As I was designing this I started with a corner connector. But I began to wonder, how to print it without supports. So I came up with a different solution. By using one connector style and offsetting them it would print without support. You can see in the picture the offset on the bottom connectors.