Methods and apparatus for additive manufacturing

A method of making a three-dimensional object from a polymerization liquid by:

• (a) providing a carrier platform, a window, and an inhibitor of polymerization, with said carrier and said window defining a build region therebetween, and with said window permeable to said inhibitor;
• (b) filling said build region with said polymerization liquid;
• and
• (c) irradiating said build region with light while advancing said carrier platform and said window away from one another and also supplying said inhibitor of polymerization through said window, to thereby form said three-dimensional object from said polymerization liquid by light polymerization while maintaining a liquid film release layer comprised of said polymerization liquid and said inhibitor between said window and said three-dimensional object;
• said method comprising:
• at least periodically delivering at least one reactant through said window into said polymerization liquid and into said three-dimensional object during said irradiating and advancing step (c),
• wherein the method further comprises providing a window feed assembly coupled to said window, and wherein said inhibitor of polymerization and said at least one reactant are supplied by said window feed assembly to be delivered through said window.