Support material formulations usable in additive manufacturing of three-dimensional objects at low temperatures

A support material formulation usable in additive manufacturing of a three-dimensional object, the formulation comprising:

• at least one hydrophilic curable material which provides, when hardened, a material that is dissolvable or swellable in an aqueous solution, in an amount of from 20 to 25 weight percent of the total weight of the formulation;
• and
• at least one non-curable material in an amount of from 65 to 80 weight percent of the total weight of the formulation,
• wherein said at least one curable material comprises a monofunctional hydrophilic curable material and a multifunctional hydrophilic curable material, wherein a weight ratio of said monofunctional and multifunctional curable materials ranges from 2:1 to 5:1, and wherein said monofunctional curable material comprises a poly (alkylene glycol) acrylate, and said multifunctional curable material comprises a polyether urethane di- or tri-acrylate, and said at least one non-curable material comprises propylene carbonate, such that a swelling capacity of said hardened material for said at least non-curable material or for a mixture of said at least non-curable material and water, if present, is of at least 70% by weight of a weight of said hardened material,
• the formulation featuring a viscosity of no more than 50 cPs at 35° C.