A method for printing three dimensional objects and support compositions are disclosed. The composition includes at least one curable component and at least one non-curable component, the non-curable component being a polyol, a glycol or water, wherein none of said non-curable components is reactive with any of said curable components. The composition has a first viscosity of 20-500 cps at ambient temperature and a second viscosity of less than 20 cps at temperature higher than the ambient temperature. The composition results in a solid, a semi solid or a gel type material after radiation.