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problem rigging chinese take-out box
I’m having difficulty rigging a simple chinese takeout box to have it fold up from a flat plane. Specifically the convex parts that fold inside the main four walls that make up the container. I feel like I need to connect these joints to the bones that make up the main four sides of the container, but there doesn’t seem to be any way to connect or join the ends of a joint chain. Is there a solution for this seemingly simply problem?

project file:
https://bit.ly/VvKP1L