Method for additive manufacturing a three-dimensional part in a layer-by-layer manner, wherein the method comprises (i) providing a carrier substrate to support the three-dimensional part and a print head connected to a reservoir of a printable composition; (ii) printing the printable composition with the print head in form of extrudate strands onto the carrier substrate to form a first layer; (iii) printing the printable composition with the print head in form of extrudate strand onto the first layer to form a second layer; (iv) optionally repeating step (iii) at least once to form a third or subsequent layer; (v) exposing the printable composition directly after printing and/or after each layer application and/or after application of multiple layer to radiation, preferably UV radiation; and (vi) curing the printed layers of the reactive curable printable composition by heating to obtain the three-dimensional part; wherein the printable composition is a pasty epoxy composition comprising - at least one epoxy resin; - at least one monomer and/or prepolymer that is polymerizable by exposure to radiation, preferably a poly(meth)acylate; and - at least one photoinitiator; wherein the pasty epoxy composition has a viscosity factor (1,5/15) of at least 2 at application temperature, wherein the viscosity factor is determined according to the method disclosed in the specification. wherein the method comprises (i) providing a carrier substrate to support the three-dimensional part and a print head connected to a reservoir of a printable composition; (ii) printing the printable composition with the print head in form of extrudate strands onto the carrier substrate to form a first layer; (iii) printing the printable composition with the print head in form of extrudate strand onto the first layer to form a second layer; (iv) optionally repeating step (iii) at least once to form a third or subsequent layer; (v) exposing the printable composition directly after printing and/or after each layer application and/or after application of multiple layer to radiation, preferably UV radiation; and (vi) curing the printed layers of the reactive curable printable composition by heating to obtain the three-dimensional part; (i) providing a carrier substrate to support the three-dimensional part and a print head connected to a reservoir of a printable composition; (ii) printing the printable composition with the print head in form of extrudate strands onto the carrier substrate to form a first layer; (iii) printing the printable composition with the print head in form of extrudate strand onto the first layer to form a second layer; (iv) optionally repeating step (iii) at least once to form a third or subsequent layer; (v) exposing the printable composition directly after printing and/or after each layer application and/or after application of multiple layer to radiation, preferably UV radiation; and (vi) curing the printed layers of the reactive curable printable composition by heating to obtain the three-dimensional part; wherein the printable composition is a pasty epoxy composition comprising - at least one epoxy resin; - at least one monomer and/or prepolymer that is polymerizable by exposure to radiation, preferably a poly(meth)acylate; and - at least one photoinitiator; - at least one epoxy resin; - at least one monomer and/or prepolymer that is polymerizable by exposure to radiation, preferably a poly(meth)acylate; and - at least one photoinitiator; wherein the pasty epoxy composition has a viscosity factor (1,5/15) of at least 2 at application temperature, wherein the viscosity factor is determined according to the method disclosed in the specification.