Dual cure resins containing microwave absorbing materials and methods of using the same

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

• (a) providing a carrier and an optically transparent member having a build surface, said carrier and said build surface defining a build region therebetween;
• (b) filling said build region with a polymerizable liquid, said polymerizable liquid comprising a mixture of (i) a microwave absorbing material, (ii) a light polymerizable liquid first component, and (iii) a second solidifiable component that is different from said first component;
• and
• (c) irradiating said build region with light through said optically transparent member to form a solid polymer scaffold from said first component and also advancing said carrier away from said build surface to form a three-dimensional intermediate having the same shape as, or a shape to be imparted to, said three-dimensional object and containing said second solidifiable component carried in said scaffold in unsolidified and/or uncured form;
• then
• (d) supporting said three-dimensional intermediate with a separate support media;
• (e) solidifying and/or curing, said second solidifiable component in said three-dimensional intermediate to form said three-dimensional object in said support media;
• and then
• (f) separating said support media from said three-dimensional object,
• wherein said support media is a solid particulate and is inert and/or water soluble.