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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

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Using a boolean modifier to substract one object from another:

The original object. enter image description here

Add a cube that intersects your original object (this will become your mold).

enter image description here

On the cube apply a boolean modifier, choose difference and select the original object.

enter image description here

hide the original object (delete it or move it to another layer)

enter image description here

once you are happy with the results you can choose to apply the modifier.

EDIT: there is also a add on that removes the step of using a modifier. Download. It has it's own tab. Just follow the steps above but instead of using a Boolean modifier use the 'direct' section in the 'booltool' tab, which is on the right side of the 3D view

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