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US 11,155,025 B2Granted
Methods for additive manufacturing of an object
AssigneesMassachusetts Institute of Technology, Stratasys, Inc.
InventorsSkylar J. E. Tibbits, Daniel Dikovsky, Shai Hirsch
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Abstract
The combination of 3D printing technology plus the additional dimension of transformation over time of the printed object is referred to herein as 4D printing technology. Particular arrangements of the additive manufacturing material(s) used in the 3D printing process can create a printed 3D object that transforms over time from a first, printed shape to a second, predetermined shape.
Claims23
A method for additive manufacturing of an object, the method comprising:
- dispensing a multiplicity of layers of a first polymerizable formulation from a three-dimensional printer, the first polymerizable formulation being a first additive manufacturing material;
- dispensing a multiplicity of layers of a second polymerizable formulation from a three-dimensional printer, the second polymerizable formulation being a second additive manufacturing material;
- wherein post-polymerization and in response to an external stimulus, the second polymerizable formulation is lower swelling than the first polymerizable formulation;
- the first and second additive manufacturing materials arranged relative to each other to form first and second joints in series that enable a predicted transformation of the object from a first manufactured shape to a second manufactured shape in response to an external stimulus, the external stimulus being non-biasing with respect to the predicted transformation from the first manufactured shape to the second manufactured shape;
- wherein for each of the first and second joints, the second additive manufacturing material is arranged to form a planar member within the joint, at least two members that extend outward from the joint, and at least two members within the joint that contact each other during the predicted transformation to restrict degree of curvature of the joint;
- wherein for each of the first and second joints, the first additive manufacturing material is arranged on the planar member of the joint;
- and
- wherein the planar members of the first and second joints are not parallel to each other.
5 more elements
Dependencies are inferred from the claim text.