A composition suitable for 3D printing, said composition being in the form of a filament and comprising: - 45 to 60 % (v/v) of a metal and/or ceramic powder selected from ceramic powder comprising or consisting of one or more carbides, sulfides, halides, oxides, hydroxides, carbonates, borates, sulfates, chromates, nitrates, molybdates, tungstates, phosphates, arsenates, vanadates, silicates and aluminosilicates; and metal powder comprising or consisting of one or more component selected from alkali metals, alkaline earth metals, lanthanides, actinides, transition metals, poor metals, metalloids, metal oxides, metal carbides, metal borides and metal nitrides; - 7 % to 25% (v/v) of a binder which is one or more components of the group selected from parabens, paraffin, esters, carboxylic acids, phenols, diphenols, fatty alcohols, sugar, polymers such as polyolefins, polyacrylates, polymethacrylates, poly(alkylene glycol)s, polyamides, polyvinylics, polystyrenes polyacetals, polyesters and their copolymers thereof; and - at least 5 % (v/v) of a mixture of medium and high vinyl acetate proportion poly (ethylene-vinyl acetate); in volume relative to the total composition, wherein: • medium vinyl acetate proportion poly (ethylene-vinyl acetate) comprises 4 % to 30 % (w/w) of vinyl acetate proportion, relative to the poly (ethylene-vinyl acetate) weight; • high vinyl acetate proportion poly (ethylene-vinyl acetate) comprises at least 35 % (w/w) of vinyl acetate proportion, relative to the poly (ethylene-vinyl acetate) weight. - 45 to 60 % (v/v) of a metal and/or ceramic powder selected from ceramic powder comprising or consisting of one or more carbides, sulfides, halides, oxides, hydroxides, carbonates, borates, sulfates, chromates, nitrates, molybdates, tungstates, phosphates, arsenates, vanadates, silicates and aluminosilicates; and metal powder comprising or consisting of one or more component selected from alkali metals, alkaline earth metals, lanthanides, actinides, transition metals, poor metals, metalloids, metal oxides, metal carbides, metal borides and metal nitrides; - 7 % to 25% (v/v) of a binder which is one or more components of the group selected from parabens, paraffin, esters, carboxylic acids, phenols, diphenols, fatty alcohols, sugar, polymers such as polyolefins, polyacrylates, polymethacrylates, poly(alkylene glycol)s, polyamides, polyvinylics, polystyrenes polyacetals, polyesters and their copolymers thereof; and - at least 5 % (v/v) of a mixture of medium and high vinyl acetate proportion poly (ethylene-vinyl acetate); in volume relative to the total composition, wherein: • medium vinyl acetate proportion poly (ethylene-vinyl acetate) comprises 4 % to 30 % (w/w) of vinyl acetate proportion, relative to the poly (ethylene-vinyl acetate) weight; • high vinyl acetate proportion poly (ethylene-vinyl acetate) comprises at least 35 % (w/w) of vinyl acetate proportion, relative to the poly (ethylene-vinyl acetate) weight. • medium vinyl acetate proportion poly (ethylene-vinyl acetate) comprises 4 % to 30 % (w/w) of vinyl acetate proportion, relative to the poly (ethylene-vinyl acetate) weight; • high vinyl acetate proportion poly (ethylene-vinyl acetate) comprises at least 35 % (w/w) of vinyl acetate proportion, relative to the poly (ethylene-vinyl acetate) weight.