MULTI-STAGE ADDITIVE MANUFACTURING SYSTEM

1 . An additive manufacturing system, comprising:

a first print stage configured to discharge a first type of composite structure;

a second print stage configured to discharge a second type of composite structure; and

a support configured to move the first and second print stages.

2 . The additive manufacturing system of claim 1 , wherein:

the first type of composite structure is a tubular structure; and

the second type of composite structure is a skin discharged adjacent the tubular structure.

3 . The additive manufacturing system of claim 2 , further including a third print stage moveable by the support and configured to apply a finish coat to the skin.

4 . The additive manufacturing system of claim 3 , wherein the first, second, and third print stages together fabricate an entire cross-section of a component.

5 . The additive manufacturing system of claim 4 , wherein the component is a boat.

6 . The additive manufacturing system of claim 5 , wherein:

the first print stage is configured to anchor the first type of composite structure to an end of a bulkhead; and

the second print stage is configured to extend the second type of composite structure over the first type of composite structure and over an outer annular surface of the bulkhead.

7 . The additive manufacturing system of claim 6 , wherein at least one of the first and second print stages is further configured to fabricate the bulkhead in-situ.

8 . The additive manufacturing system of claim 6 , wherein the bulkhead is pre-fabricated.

9 . The additive manufacturing system of claim 1 , wherein:

the first print stage includes a plurality of first print heads chained to each other; and

the second print stage includes a plurality of second print heads changed to each other.

10 . The additive manufacturing system of claim 1 , wherein the second print stage follows behind the first print stage a distance such that a matrix in the first type of composite structure is not fully cured when the second type of composite structure overlaps the first type of composite structure.

11 . The additive manufacturing system of claim 1 , further including a controller in communication with the support and configured to regulate movements of the first and second print stages.

12 . A method of additive manufacturing, comprising:

discharging from a first type of print head a first type of composite structure; and

simultaneously discharging from a second type of print head a second type of composite structure adjacent the first type of composite structure.

13 . The method of claim 12 , wherein:

the first type of composite structure is a tubular structure; and

the second type of composite structure is a skin.

14 . The method of claim 13 , further including simultaneously applying a finish coat to the skin.

15 . The method of claim 14 , wherein the tubular structure, skin, and finish coat together form a cross-section of a boat.

16 . The method of claim 15 , further including:

anchoring the tubular structure to an end of a bulkhead; and

extending the skin over the tubular structure and over an outer annular surface of the bulkhead.

17 . The method of claim 16 , further including discharging the bulkhead from a composite material in-situ.

18 . The method of claim 12 , wherein:

discharging from the first type of print head includes discharging from a plurality of the first type of print heads that have been chained to each other; and

discharging from the second type of print head includes discharging from a plurality of the second type of print heads that have been chained to each other.

19 . The method of claim 12 , further including moving the plurality of the second type of print heads to follow behind the plurality of the first type of print heads by a distance such that a matrix in the first type of composite structure is not fully cured when the second type of composite structure overlaps the first type of composite structure.

20 . A method of additive manufacturing, comprising:

discharging a plurality of composite tubes adjacent each other to form an internal skeleton in a shape of a boat hull; and

simultaneously discharging a composite skin over the plurality of composite tubes,

wherein a matrix in the plurality of composite tubes is not fully cured when the composite skin is discharged over the plurality of composite tubes.