3D PRINTING METHOD AND SYSTEM

1 . A three-dimensional (3D) printing method, comprising:

step S 101 , printing, according to a first print path, an Nth sliced layer of a to-be-printed object, wherein N is a positive integer greater than or equal to 1;

step S 102 , printing, according to a second print path, an (N+1)th sliced layer of the to-be-printed object, wherein the second print path is a reverse path of the first print path; and

step S 103 , repeatedly performing the step 101 and the step 102 , till printing is completed.

2 . The 3D printing method according to claim 1 , wherein printing the Nth sliced layer of the to-be-printed object according to the first print path comprises:

performing layering processing on the to-be-printed object to obtain a plurality of sliced layers; and

printing the Nth sliced layer of the plurality of sliced layers according to the first print path.

3 . The 3D printing method according to claim 2 , wherein after performing the layering processing on the to-be-printed object to obtain the plurality of the layers, the method further comprises:

generating layer-print data according to the plurality of the sliced layers, wherein the layer-print data includes a first sequence and a second sequence, a path formed by the layer-print data in the first sequence is the first print path, and a path formed by the layer-print data in the second sequence is the second print path.

4 . The 3D printing method according to claim 3 , wherein the first sequence and the second sequence are reversed to each other.

5 . The 3D printing method according to claim 3 , wherein when transmitted, the layer-print data includes the first sequence and the second sequence that are mutually reversely transmitted.

6 . The 3D printing method according to claim 3 , wherein when stored, the layer-print data includes the first sequence and the second sequence that are mutually reversely stored.

7 . The 3D printing method according to claim 1 , wherein before printing the (N+1)th sliced layer of the to-be-printed object according to the second print path, the method further comprises:

determining an end position of the first print path; and

setting the end position of the first print path as a start position of the second print path.

8 . The 3D printing method according to claim 7 , wherein determining the end position of the first print path comprises:

obtaining a length D of the Nth sliced layer in a secondary scanning direction;

obtaining a single-time moving distance d of the printhead in the secondary scanning direction, the single-time moving distance d being a moving distance of the printhead in the secondary scanning direction after the printhead completes printing in a primary scanning direction on the Nth sliced layer;

obtaining, according to the length D and the single-time moving distance d, a number n of moves of the printhead along the secondary scanning direction on the Nth sliced layer; and

determining, according to the number n of the moves, the end position of the first print path.

9 . The 3D printing method according to claim 8 , wherein determining the end position of the first print path according to the number n of the moves comprises:

if the number n of the moves is an odd number, determining that the end position of the first print path is located on a same side of the start position of the first print path; and

if the number n of the moves is an even number, determining that the end position of the first print path is located on a different side of the start position of the first print path.

10 . The 3D printing method according to claim 8 , wherein:

the end position of the first print path coincides with the start position of the second print path; and

an end position of the second print path and a start position of the first path are coincident or not coincident.

11 . A three-dimensional (3D) printing system, comprising:

a printhead, configured to eject a printing material;

a drive controller, configured to control the printhead to print according to print data; and

a processor, configured to generate the print data, wherein the print data is configured to include instructions:

S 101 , printing, according to a first print path, an Nth sliced layer of a to-be-printed object, wherein N is a positive integer greater than or equal to 1;

S 102 , printing, according to a second print path, an (N+1)th sliced layer of the to-be-printed object, wherein the second print path is a reverse path of the first print path; and

S 103 , repeatedly performing the step 101 and the step 102 , till printing is completed.

12 . The 3D printing system according to claim 11 , wherein the print data includes the instructions further causing the print head to:

perform layering processing on the to-be-printed object to obtain a plurality of sliced layers; and

print the Nth sliced layer of the plurality of sliced layers according to the first print path.

13 . The 3D printing system according to claim 12 , wherein the print data includes the instructions further causing the print head to:

generate layer-print data according to the plurality of the sliced layers, wherein the layer-print data includes a first sequence and a second sequence, a path formed by the layer-print data in the first sequence is the first print path, and a path formed by the layer-print data in the second sequence is the second print path.

14 . The 3D printing system according to claim 13 , wherein the first sequence and the second sequence are reversed to each other.

15 . The 3D printing system according to claim 13 , wherein when transmitted, the layer-print data includes the first sequence and the second sequence that are mutually reversely transmitted.

16 . The 3D printing system according to claim 13 , wherein when stored, the layer-print data includes the first sequence and the second sequence that are mutually reversely stored.

17 . The 3D printing system according to claim 11 , wherein the print data includes the instructions further causing the print head to:

determine an end position of the first print path; and

set the end position of the first print path as a start position of the second print path.

18 . The 3D printing system according to claim 17 , wherein the print data includes the instructions further causing the print head to:

obtain a length D of the Nth sliced layer in a secondary scanning direction;

obtain a single-time moving distance d of the printhead in the secondary scanning direction, the single-time moving distance d being a moving distance of the printhead in the secondary scanning direction after the printhead completes printing in a primary scanning direction on the Nth sliced layer;

obtain, according to the length D and the single-time moving distance d, a number n of moves of the printhead along the secondary scanning direction on the Nth sliced layer; and

determine, according to the number n of the moves, the end position of the first print path.

19 . The 3D printing system according to claim 18 , wherein the print data includes the instructions further causing the print head to:

if the number n of the moves is an odd number, determine that the end position of the first print path is located on a same side of the start position of the first print path; and

if the number n of the moves is an even number, determine that the end position of the first print path is located on a different side of the start position of the first print path.

20 . The 3D printing system according to claim 18 , wherein:

the end position of the first print path coincides with the start position of the second print path; and

an end position of the second print path and a start position of the first path are coincident or not coincident.