This Model is another collaboration by Keishiro Ueki and me Ruven Bals. Keishiro invented the mechanism and I made the 3D model and the Guides. It's a Variation of the Jitterbug. That's also used in my Expander.

Take a look at Keishiro's Work on his maker world profile.

You Need:
8 Triangles
12 Connectors
The tool is optional.
You can also use glue instead of using the printed Connectors.

Print Settings:
Standard for your Filament. No Supports.

Assembly:
I made a PDF Guide that's included in the download as well as a Video Guide.

Troubleshooting:
If the Connectors break, just use glue to connect the Triangles.
If the hinges don't work smoothly, try using a smaller layer height or the "fine" profile in your Slicer