The Mesh Analysis panel performs similar functions to the Print3D Toolbox, but it has a more graphic interface and is more interactive. It's located in the 3D View Properties panel on the right-hand side of the 3D View window. You must be in edit mode to see it:
4597_03_Distorted Cube.blendfile. This distorted cube is a very bad candidate for 3D printing. Make sure you are in Edit Mode and scroll down in the Properties panel of the 3D View window until you see the Mesh Analysis subpanel.