Molding an object - Negative mold

Hello everyone!
I am trying to use my 3D Scanner and 3D Printer to make Molding of the objects using non printable materials.

For instance, if I 3D Scan a cup I get an OBJ / STL model ready to work with. But I would like to make a mold of it. Does blender have any resource to “invert” the solid? Then I woul print the mold and pour the material inside this “bucket” of mold.

Thank you.
Best,
Rick

Yes, but you’re likely better off printing the plug, finishing that and making the mold the old-fashioned way. Positive form is easier to finish, you can capture finished surface detail easily with various molding materials, and used time and material cost to make a rigid mold is probably much less when making it without 3D printing.

http://www.blenderartists.org/forum/showthread.php?303282-Preparing-meshes-for-printing-a-negative-form-for-a-sculpture&p=2439755&viewfull=1#post2439755