I've been wanting to design a non-planar preassembled mechanism for awhile, but it took Prot0typ1cal's Venus Box to inspire me on what to make. That is a beautiful design, but the more I thought about it, the more I thought it should be possible to print without assembly. Combining that spherical box idea with my earlier iris box concept lead to this design.

You can see how it works and how to free it up after printing here: https://youtu.be/-m8uWz-qf7Y