Systems and methods for fabricating three-dimensional objects

1. A system for additive manufacturing, comprising:

a container for holding a photosensitive medium adapted to change states upon exposure to a light source;

an optical imaging system, configured to move above the container holding the photosensitive medium, and having the light source; and

a control system configured to:

slice a digital model of a three-dimensional object into a slice having a cross section;

generate a build cross section by filling a two-dimensional image with one or more copies of the cross section;

add to the build cross section a conformal regular lattice having a repeating structure to fill space in the build cross section around the one or more copies of the cross section; and

control movement of the optical imaging system above the container to cure a portion of the photosensitive medium corresponding to the build cross section including the conformal lattice to produce both a layer of a three-dimensional object and a portion of the conformal lattice.

2. The system of claim 1 , wherein the control system is further configured to:

slice the digital model into a plurality of slices, each slice having a respective cross section; and

generate the build cross section by filling the two-dimensional image with one or more copies of a first cross section selected from the group of the respective cross sections of the plurality of slices.

3. The system of claim 1 , wherein the control system is further configured to add, to the build cross section, a break line through the conformal lattice.

4. The system of claim 1 , wherein the control system is further configured to add to the build cross section a tank wall to a perimeter of the two-dimensional image.

5. The system of claim 1 , wherein the control system is further configured to add to the build cross section a conformal wall spaced around the one or more copies of the cross section and conforming to a shape of the cross section.

6. The system of claim 1 , wherein

the two-dimensional image has a predetermined size corresponding to a size of the container, and

the control system is configured to:

generate the build cross section by filling the two-dimensional image having the predetermined size with a plurality of copies of the cross section; and

add to the build cross section by adding to the build cross section a conformal lattice to fill space in the build cross section between the plurality of copies of the cross section.

7. The system of claim 6 , wherein the control system is further configured to add to the build cross section a plurality of break lines through the plurality of copies of the cross section.

8. The system of claim 6 , wherein

the control system is further configured to add to the build cross section a plurality of conformal walls spaced around the plurality of copies of the cross section, and the conformal lattice spans between the plurality of conformal walls.

9. The system of claim 5 , wherein curing the conformal wall spaced around the cured cross section forms a moat between the wall and the object.

10. The system of claim 8 , wherein curing the plurality of conformal walls spaced around the cured cross sections forms a plurality of moats between the plurality of conformal walls and the objects.