Cardboard Brick to make a Roman Arch

This is the net for a brick you can fold out of 3mm cardboard. It is sized to make the largest possible brick I could on my 18X24 Epilog Laser bed.

If you print nine of these, you can make a roman arch. They were used in 6th Grade history to introduce Roman history. Tape is not needed to hold this together (it was used by students in their "dig" to show they'd tampered with the site).

Prompt 1: A Simulated Dig.
We printed ~100 and left them around as an archeological dig with some large 3D printed artifacts:
Hadrian's Bust http://www.thingiverse.com/thing:248216
Roman Torso http://www.thingiverse.com/thing:26536
A relief http://www.thingiverse.com/thing:239387
Random Egyptian Artefact http://www.thingiverse.com/make:78124
Bones (for good measure) http://www.thingiverse.com/make:52940
The students then had to identify what the original structure was and justify their conclusions based on research.

Prompt 2: Building with Arches.
Students were first paired in teams of two and told to build the arch together. Once they figured out how to do so, they could work with other teams and build objects that used multiple arches. In the pictures you can see them trying to build an aqueduct, dome, etc.