摘要：
The invention relates to a method (10) for preventing detachment of a 3D part (1) from a build plate (2) of a 3D printing system (20) for fabricating the 3D part using an extrusion-based additive manufacturing process. The method comprises providing an intermediate structure (3) on top of the build plate, the intermediate structure having a surface that is larger than a print area required for printing the 3D part on top of the intermediate structure, and printing tracks of extruded feedstock material to fabricate the 3D part and at least one auxiliary structure (4) that is arranged next to the 3D part for preventing detachment of the 3D part from the build plate. Herein, the at least one auxiliary structure (4) covers less than 50% of the surface of the intermediate structure (3). The invention also relates to a 3D printing system for performing the method according to the invention, and a 3D part fabricated using an extrusion-based additive manufacturing process performed by said 3D printing system.
权利要求：
CLAIMS
1. A method (10) for preventing detachment of a three-dimensional (3D) part (1) from a build plate (2) of a 3D printing system (20) that is configured and arranged to fabricate the 3D part (1) using an extrusion-based additive manufacturing process, the method (10) comprising: providing (11a, 11b) an intermediate structure (3) on top of the build plate (2), the intermediate structure (3) being configured to have a surface that is larger than a print area that is required to print the 3D part (1) on top of the intermediate structure (3); printing (12) tracks of extruded feedstock material to fabricate the 3D part (1) and at least one auxiliary structure (4) that is arranged next to the 3D part (1) and configured to prevent detachment of the 3D part (1) from the build plate (2), wherein the at least one auxiliary structure (4) covers less than 50% of the surface of the intermediate structure (3).
2. The method (10) according to claim 1, wherein the at least one auxiliary structure covers less than 45%, 40%, 35%, 30%, 25%, 20%, 15%, 10%, or 5% of the surface of the intermediate structure 3.
3. The method (10) according to claim 1 or 2, comprising the step of printing a set of auxiliary structures (4) around the 3D part (1).
4. The method of claim 3, wherein at least one auxiliary structure (4) of said set has an elongated shape and a longitudinal center line (5), wherein the longitudinal center line
(5) is arranged at a non-zero angle (a) with respect to an adjacent side surface of the 3D part (1).
5. The method (10) according to one of the previous claims, the method (10) comprising:
- printing the at least one auxiliary structure (4) such that the at least one auxiliary structure (4) is arranged at a respective predefined first distance ( d1 ) from the 3D part (1) and/or at a respective predefined second distance ( d2 ) from an edge (6) of the intermediate structure (3).
6. The method (10) according to one of the previous claim 3 and/or 5, wherein, if said set comprises more than one elongated auxiliary structure (4), at least one of the respective predefined first distance ( d1 ) and the respective predefined second distance (d2) regarding at least one of the elongated auxiliary structures (4) of said set is different from at least one of the respective predefined first distances and the respective predefined second distances regarding at least one other elongated auxiliary structure of said set.
7. The method (10) according to any one of the claims 1 to 6, wherein the at least one auxiliary structure (4) has a height ( h ) in a range of 10 mm to 25 mm.
8. The method (10) according to any one of the previous claims, wherein the at least one elongated auxiliary structure (4) has a width (w) in a range from 2 mm to 10 mm.
9. The method (10) according to any one of the claims 1 to 8, wherein the step of providing the intermediate structure (3) on top of the build plate (2) comprises: printing (11a) tracks of extruded feedstock material to fabricate the intermediate structure (3) on top of the build plate (2).
10. The method (10) according to any one of the claims 1 to 8, wherein providing the intermediate structure (3) on top of the build plate (2) comprises: attaching (11 b) a pre-processed intermediate structure (3) on top of the build plate (2).
11. The method (10) according to any one of the claims 1 to 10, wherein the at least one auxiliary structure (4) has an open or closed shape.
12. The method (10) according to any one of the claims 1 to 11, wherein the at least one auxiliary structure (4) is either one of a completely solid structure, a hollow structure or a structure provided with a predefined filling pattern.
13. A 3D printing system (20) that is configured to fabricate a 3D part (1) using an extrusion-based additive manufacturing process according to the method of any one of the claims 1 to 11, the 3D printing system (20) being operatively connected to a processing unit (21) provided with computer instructions which, if executed in the processing unit (21), perform the method (10).
14. The 3D printing system (20) according to claim 13, wherein the processing unit (21) is integrated within the 3D printing system (20). 15. A 3D part (1) that is fabricated using an extrusion-based additive manufacturing process that is performed using a 3D printing system (20) according to claim 13 or 14.