Infill and Density

This is an activity that has two objectives: First to become familiar with 3D printing time, material consumption etc, as well as how we can have different properties in the printed object, and second, to experiment with the physics of density and buoyancy (Archimedes principle).
It proposes to print 3 "identical" cubes with different infill values, 2 of them have a known infill value, because it is indicated on the top face, but it is up to you to define the infill of the third cube, which wil