Patent ID: 9688021
Date: 2017-06-27
CPC Classifications: B29C,B33Y

Claim:
1. A method of additive manufacturing of a three-dimensional object, comprising sequentially forming a plurality of layers in a configured pattern corresponding to the shape of the object, said forming comprising, for each layer, dispensing at least one modeling material to form an uncured layer, and curing said uncured layer by radiation, wherein the method comprises, for at least one layer, forming a stack of sacrificial radiation-protective layers to cover an exposed portion of modeling material in said layer, such that an upper layer of said stack remains exposed during formation of any subsequent layer of said plurality of layers, wherein said stack has at least 30 sacrificial radiation-protective layers, and wherein each layer in said stack is at least 15 microns in thickness; and removing said stack to reveal said portion of modeling material beneath said stack, wherein said portion of modeling material beneath said stack is part of the object.