| http://www.w3.org/ns/prov#value | - A method of forming a three-dimensional article comprising: a. forming a layer of a photohardenable composition comprising (i) a mixture of cationically polymerizable components having at least two epoxy resins, said at least two epoxy resins including a first epoxy resin polymerizing at a slower rate and having a higher neat viscosity that at least one other epoxy resin present, (ii) a blend of r
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