Integral Calculus

I am preparing some integral calculus prints. The first is the solid obtained by revolving the region between the graph of y=4-x^2 and the x-axis on [0,2] around the y-axis, and the model on the right is an approximation of that solid using eight shells, designed by mathgrl.

Here is a view of all the calculus volumes collection. 

Four volumes

Pencil for scale