Natural vs. Man-made structures

The project I worked on most during quarter two was my science fair project. I am testing the compressive strength of natural structures versus man-made structures. By 3D printing each structure, variables such as materials ar taken out of consideration. While 3D printing my structures, I had issued developing the arches. First the model that i was using wasent compatable with the platform we use for 3D printing. Than after we found a model that would print, the arches dimensions needed to be changed because the top of the arches kept breaking. This took a long time to figure out how to keep everything proportional but allowed me to learn more about 3D printing and the specific platform we use. After I printed each structure out, I used a force meter to compress them until they broke. This was sad because they took so long to print out.