Impossible sphere inside a cube

This simple model is something you can make to test your 3D printers abilities. The first step in making this sphere inside a cube model, is to print the inside sphere model. After that has finished, clean it up with sand paper our some over form of smoothing, and set it aside. You should now change your plastic color for a better effect. Next start printing the outside cube, when you get halfway through the print, pause the printer and put the sphere in the half done cube. Finish the print and , voilà you now have a multi-colored sphere in a cube!

If you make this, please post a picture!