Dual cure epoxy formulations for 3d printing applications

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;
• 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;
• and
• at least one photoinitiator;
• wherein the pasty epoxy composition has a viscosity factor (1.5/15) of at least 2 at application temperature.