Compositions and methods for use in three dimensional model printing

A composition suitable for support in building a three dimensional object, said composition comprising:

• at least one curable component,
• at least one non-curable component, said non-curable component being a polyol or glycol compound,
• wherein none of said non-curable components is reactive with any of said curable components;
• a surface additive for reducing surface tension;
• and
• a stabilizer;
• wherein all components of the composition are either miscible or soluble in the composition and said composition has a first viscosity of 100-500 cps at ambient temperature and a second viscosity of <20 cps at a temperature higher than said ambient temperature;
• wherein, after irradiation, said composition results in a solid, a semi solid or a gel material capable of dissolving or swelling upon exposure to water, to an alkaline or acidic water solution or to a water detergent solution.