CPC B29C 64/124 (2017.08) [B29C 64/245 (2017.08); B29C 64/321 (2017.08); B29C 64/364 (2017.08); B33Y 10/00 (2014.12); B33Y 30/00 (2014.12); B33Y 40/00 (2014.12)] | 14 Claims |
1. A method of reducing irregularity of an oxygen gradient across the window of a bottom-up additive manufacturing apparatus during production of a three-dimensional object thereon, comprising:
(a) producing said object from a polymerizable liquid on a window, said window comprising:
(i) an optically transparent semipermeable member, on which semipermeable member said three-dimensional object is produced;
(ii) a fluid supply bed in or adjacent said semipermeable member, from which supply bed a polymerization inhibitor is fed through said semipermeable member;
(iii) at least a first and second fluid orifice connected to said supply bed on opposite sides thereof and in fluid communication with one another through said supply bed; while
(b) feeding a fluid comprising said polymerization inhibitor through one of said orifices, optionally while drawing a vacuum through the other of said orifices; and
(c) periodically reversing the flow of the fluid through said supply bed.
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