Method and system for solid freeform fabrication

A three-dimensional object obtained in layerwise solid freeform fabrication, the object comprising a plurality of layers, at least one layer comprising:

• a core region made, at least in part, of a first hardened modeling material formed of a voxelated combination between a first modeling material and a second modeling material, an inner envelope region at least partially surrounding said core region and being made, at least in part, of a second hardened modeling material formed of said first modeling material but not said second modeling material, and an outer envelope region at least partially surrounding said inner envelope region and being made, at least in part, of a third hardened modeling material formed of said second modeling material but not said first modeling material;
• wherein each of said first modeling material and said second modeling material comprises at least one UV-curable material, and wherein said first modeling material and said second modeling material differ from one another, when hardened, by at least one of:
• Heat Deflection Temperature (HDT), Izod Impact resistance and elastic modulus.