Difference between solids and shapes

thingiverse

People will find learning easier with three models that demonstrate a Cube, Sphere and Pyramid in 1x1x1 sizes. These models are especially helpful for teaching children about the distinction between shapes and solids when some students struggle to grasp this concept. One of the coolest things about 3D printing is that it can show how the first layer forms a shape (square), but as it builds upwards, it turns into a solid (cube). Instructions Use the sphere model to explain the difference between an empty inside sphere and a ball (which is full).