Build patterns for surfaces of a three-dimensionally printed object
Linear lengths of build material are initially deposited spaced apart from one another, with the resulting gaps or offsets filled in by subsequent deposition passes. In this manner, each straight length of material can cool independently before bonding to other adjacent lengths of material, thereby avoiding or mitigating non-axial stresses on each linear length of material as it cools.
1. A method for forming a portion of an object being fabricated in a three-dimensional fabrication process, comprising:
depositing build material around a two-dimensional cross-section of the object at a first z-axis height thereby forming a border of the object;
depositing a first plurality of lengths of build material within the border, the first plurality of lengths spaced apart by a predetermined distance such that there is a gap disposed between each length included in the first plurality of lengths, wherein the gap separates the first plurality of lengths by a predetermined distance that is less than a known width of a solidified length of build material; and
depositing a second plurality of lengths of build material including individual lengths deposited in the gaps disposed between each length in the first plurality of lengths to create a closed surface within the border, the closed surface being planar, wherein each individual length of the second plurality of lengths filling one of the gaps is deposited before adjacent ones of the first plurality of lengths that form the one of the gaps have cooled to a temperature of a surrounding environment.
2. The method of claim 1 , wherein the first plurality of lengths are consecutively deposited to span the border, and wherein the second plurality of lengths are consecutively deposited after the first plurality of lengths.
3. The method of claim 1 , wherein the first plurality of lengths and the second plurality of lengths are deposited such that no consecutively deposited lengths of build material are located directly adjacent to one another.
4. The method of claim 1 , wherein each length in the second plurality of lengths fills each gap disposed between each length included in the first plurality of lengths.
5. The method of claim 1 , wherein the two-dimensional cross-section includes an exposed surface of the object.
6. The method of claim 1 , wherein the two-dimensional cross-section includes a surface layer of a raft fabricated for the object.
7. The method of claim 1 , wherein the two-dimensional cross-section includes a first layer of the object.
8. The method of claim 1 , wherein the two-dimensional cross-section includes a first layer of a bridge fabricated for the object.
9. The method of claim 1 , wherein the two-dimensional cross-section includes a top layer of a base of the object.
10. The method of claim 1 , wherein the closed surface is a water-tight surface.
11. The method of claim 1 , wherein each one of the first plurality of lengths of build material is parallel to each other one of the first plurality of lengths.
12. The method of claim 1 , wherein the second plurality of lengths are deposited at a greater volume deposition rate than the first plurality of lengths.
13. A method for forming a portion of an object being fabricated in a three-dimensional fabrication process, comprising:
depositing build material around a two-dimensional cross-section of the object at a first z-axis height thereby forming a border of the object;
depositing a plurality of lengths of build material within the border, the plurality of lengths deposited in a build pattern comprising:
at least two consecutive lengths of build material deposited directly adjacent to one another;
a third length of build material deposited directly after the two consecutive lengths, the third length located offset from the two consecutive lengths by a predetermined distance such that there is a gap between the two consecutive lengths and the third length, wherein the predetermined distance is less than a known width of a solidified length of build material; and
a fourth length of build material deposited in the gap between the two consecutive lengths and the third length, wherein the fourth length is deposited before at least one of the two consecutive lengths and the third length have cooled to a temperature of a surrounding environment; and
repeating the build pattern until a closed surface is formed within the border, wherein the closed surface is planar.
14. The method of claim 13 , wherein the fourth length of build material fills the gap between the two consecutive lengths and the third length.
15. The method of claim 13 , wherein the closed surface is a water-tight surface.
16. The method of claim 13 , wherein the two-dimensional cross-section includes an exposed surface of the object.
17. The method of claim 13 , wherein the two-dimensional cross-section includes at least one of a surface layer of a raft fabricated for the object, a first layer of the object, a first layer of a bridge fabricated for the object, and a top layer of a base of the object.
18. The method of claim 13 , wherein each of the plurality of lengths of build material is parallel to one another.
19. The method of claim 18 , wherein each of the plurality of lengths of build material is linear.
20. The method of claim 13 , wherein the fourth length is deposited at a greater volume deposition rate than at least one of the two consecutive lengths and the third length.