Skillful three-dimensional printing

1. A method for printing a three-dimensional object, comprising:

(I) providing at least one controller configured to:

(a) direct an energy source to generate an energy beam that irradiates an exposed surface of a material bed comprising a pre-transformed material at a first position using an energy beam during a first time period of at least one tenth of a millisecond, to transform the pre-transformed material at the first position to a transformed material to form a first tile as part of the three-dimensional object, which first position is along a path-of-tiles, wherein during the first time period, the energy beam is stationary or substantially stationary;

(b) direct a guidance system to translate the energy beam to a second position of the exposed surface along the path-of-tiles, which second position is different from the first position, wherein the energy beam is translated during an intermission without transforming the pre-transformed material along the path-of-tiles;

(c) direct the guidance system to direct the energy beam to irradiate the exposed surface of the material bed at the second position with the energy beam at the second position during a second time period of at least one tenth of a millisecond, to transform the pre-transformed material at the second position to the transformed material to form a second tile as part of the three-dimensional object, wherein during the second time period, the energy beam is stationary or substantially stationary; and

(II) using the at least one controller to form the first tile and the second tile as part of the three-dimensional object.

2. The method of claim 1 , wherein translating the energy beam from the first position to the second position is within a time period of at least 1 millisecond.

3. The method of claim 1 , further comprising dispensing a layer of the pre-transformed material by removing an excess of pre-transformed material from the exposed surface of the material bed using a gas flow and cyclonically separating the pre-transformed material from the gas flow.

4. The method of claim 1 , wherein in (a) and/or (c), the energy beam that is stationary or substantially stationary comprises spatial oscillations of the energy beam that are smaller than a diameter of the energy beam.

5. The method of claim 1 , wherein in (a) and/or (c), substantially stationary is such that the energy beam at most undergoes back and forth movement with respect to the first position on the exposed surface.

6. The method of claim 1 , wherein the three-dimensional object comprises one or more layers with a radius of curvature of at least five centimeters.

7. The method of claim 1 , wherein the three-dimensional object has a porosity of at most 10%.

8. The method of claim 1 , wherein the first time period and/or second time period is of at least one millisecond.

9. The method of claim 1 , wherein during translation of the energy beam from the first position to the second position, the energy beam provides no radiation.

10. The method of claim 1 , wherein during translation of the energy beam from the first position to the second position, the energy beam provides a reduced amount of radiation that is insufficient to transform the pre-transformed material along the path-of-tiles.

11. The method of claim 1 , wherein during translation of the energy beam from the first position to the second position, the energy beam irradiates a portion of the material bed that is not along the path-of-tiles.

12. The method of claim 1 , wherein the second tile contacts the first tile.

13. The method of claim 1 , wherein the second tile at least partially overlaps the first tile.

14. The method of claim 1 , further comprising (d) translating the energy beam to a third position of the exposed surface along the path-of-tiles, which third position follows the second position along the path-of-tiles and is different from the first position and different from the second position, which energy beam is translated during another intermission without transforming the pre-transformed material along the path-of-tiles; and (e) irradiating the exposed surface of the material bed by the energy beam at the third position during a third time period to transform the pre-transformed material at the third position to the transformed material to form a third tile as part of the three-dimensional object, which third tile contacts the second tile, wherein during the third time period, the energy beam is stationary or substantially stationary, wherein the third tile follows the second tile that follows the first tile along the path-of-tiles.

15. The method of claim 14 , wherein the first tile, second tile, and third tile, are successively arranged in single file.

16. An apparatus for printing a three-dimensional object, comprising at least one controller that is operatively coupled to an energy source and a guidance system, which at least one controller is configured to:

(a) direct the energy source to generate an energy beam that irradiates an exposed surface of a material bed at a first position using an energy beam during a first time period of at least one tenth (0.1) of a millisecond, to transform a pre-transformed material in the material bed at the first position to a transformed material to form a first tile as part of the three-dimensional object, which first position is along a path-of-tiles, wherein during the first time period, the energy beam is stationary or substantially stationary;

(b) direct the guidance system to translate the energy beam to a second position of the exposed surface along the path-of-tiles, which second position is different from the first position, wherein the energy beam is translated during an intermission without transforming the pre-transformed material along the path-of-tiles; and

(c) direct the guidance system to direct irradiation of the energy beam at the exposed surface of the material bed at the second position with the energy beam at the second position during a second time period of at least one tenth (0.1) of a millisecond, to transform the pre-transformed material at the second position to the transformed material to form a second tile as part of the three-dimensional object, wherein during the second time period, the energy beam is stationary or substantially stationary.

17. The apparatus of claim 16 , wherein the at least one controller is configured to direct the guidance system to translate the energy beam from the first position to the second position within a time period of at least 1 millisecond.

18. The apparatus of claim 16 , wherein the at least one controller is operatively coupled to a layer dispenser, and is configured to direct the layer dispenser to (i) dispense a layer of the pre-transformed material, (ii) remove an excess of pre-transformed material from the exposed surface of the material bed using a gas flow, and (iii) cyclonically separate the pre-transformed material from the gas flow.

19. The apparatus of claim 16 , wherein the first time period and/or second time period is of at least one millisecond.

20. The apparatus of claim 16 , wherein during translating the energy beam from the first position to the second position, the at least one controller is configured to direct the energy source to cease generating the energy beam.

21. The apparatus of claim 16 , wherein during translating the energy beam from the first position to the second position, the at least one controller is configured to direct the energy source to generate the energy beam at a reduced amount of radiation that is insufficient to transform the pre-transformed material along the path-of-tiles.

22. The apparatus of claim 16 , wherein the second tile contacts the first tile.

23. The apparatus of claim 16 , wherein the second tile at least partially overlaps the first tile.

24. The apparatus of claim 16 , wherein the at least one controller is further configured to: (d) direct the guidance system to translate the energy beam to a third position of the exposed surface along the path-of-tiles, which third position follows the second position along the path-of-tiles and is different from the first position and different from the second position, which energy beam is translated during another intermission without transforming the pre-transformed material along the path-of-tiles; and (e) direct the guidance system to direct irradiation of the energy beam at the exposed surface of the material bed by the energy beam at the third position during a third time period to transform the pre-transformed material at the third position to the transformed material to form a third tile as part of the three-dimensional object, which third tile contacts the second tile, wherein during the third time period, the energy beam is stationary or substantially stationary, wherein the third tile follows the second tile that follows the first tile along the path-of-tiles.

25. The apparatus of claim 24 , wherein the first tile, second tile, and third tile, are successively arranged in single file.