I have the following 3D-model:
RevolutionPlot3D[Sqrt[E^-x (1 + E^x)^2], {x, 0, 4},
RevolutionAxis -> {1, 0, 0}]
Is there a way to make this model into a solid so that I can export it to let it be printed by a 3D printer. Now it is kind of hollow from the inside but I want it to be filled.