Epoxy dual cure resins for additive manufacturing

A method of forming a three-dimensional object, comprising:

• (a) providing an epoxy dual cure resin;
• (b) forming a three-dimensional intermediate from said resin, where said intermediate has the shape of, or a shape to be imparted to, said three-dimensional object, wherein said resin is solidified by exposure to light, and wherein said forming step is carried out by either bottom-up three-dimensional fabrication between a carrier and a build surface or top-down three-dimensional fabrication between a carrier and a fill level, the fill level optionally defined by a build surface;
• then
• (c) optionally washing the three-dimensional intermediate, and
• (d) heating and/or microwave irradiating said three-dimensional intermediate sufficiently to further cure said resin and form said three-dimensional object;
• wherein said epoxy dual cure resin comprises:
• (i) a photoinitiator;
• (ii) monomers and/or prepolymers that are polymerizable by exposure to actinic radiation or light;
• (iii) optionally, a light absorbing pigment or dye;
• (iv) an epoxy resin;
• (v) an organic hardener co-polymerizable with said epoxy resin;
• (vi) optionally a dual reactive compound having substituted thereon a first reactive group reactive with said monomers and/or prepolymers that are polymerizable by exposure to actinic radiation or light, and a second reactive group reactive with said epoxy resin;
• (vii) optionally a diluent;
• (viii) optionally a filler;
• and
• (ix) optionally, a co-monomer and/or a co-prepolymer.