Archimedes and the Crown

I designed the figures in Sculptris and then transferred them to 3D Builder to level them for printing; since I am very new at this and it is my first time using 3D Builder, please let me know if the file format doesn't work or it has other problems.

Archimedes of Syracuse (c. 287 – 212 BC) was one of the greatest mathematicians and scientists who ever lived. He derived an accurate approximation of pi and discovered forumae for calculating the area of a circle, the surface area of a sphere,