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. 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.
技术问题语段：
The technical problem of this patent text is to improve the production yield of high-performance 3D printed parts that meet the requirements of critical applications in fields such as medical, automotive, or aerospace, while reducing the costs of the printed parts. This should be achieved by providing a method and a 3D printing system adapted to perform the method that can fabricate as many 3D parts as possible while ensuring optimal mechanical properties, aesthetic properties, and precise dimensions.
技术功效语段：
The present invention provides a method for improving the production yield of high-performance 3D parts by preventing detachment of the 3D part from the build plate of a 3D printing system that is configured and arranged to fabricate the 3D part using an extrusion-based additive manufacturing process. This method can pre-empt or at least reduce the disadvantages associated with fabricating high-performance 3D parts using extrusion-based additive manufacturing printing processes known in the art. Additionally, the present invention provides a 3D printing system that is configured and arranged to perform the method, allowing an improvement of the production yield of the 3D parts obtained.
权利要求：
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).
2. The method (10) according to claim 1, the method (10) comprising: - printing a set of auxiliary structures (4) around the 3D part (1), wherein at least one auxiliary structure (4) of said set has an elongated shape and a longitudinal center line (5), the at least one elongated auxiliary structure being arranged such that the longitudinal center line (5) is arranged at a non-zero angle with respect to an adjacent side surface of the 3D part (1).
3. The method (10) according to claim 2, the method (10) comprising: - printing the at least one elongated auxiliary structure (4) of said set such that the at least one elongated auxiliary structure (4) is arranged at a respective predefined first distance, d1, from the 3D part (1) and at a respective predefined second distance, d2, from an edge (6) of the intermediate structure (3).
4. The method (10) according to claim 3, wherein the respective predefined first distance, d1, and the respective predefined second distance, d2, are non-zero.
5. The method (10) according to claim 3 or 4, 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.
6. The method (10) according to any one of the claims 1 to 5, wherein the at least one auxiliary structure (4) has a height, h, in a range from 10mm to 25mm.
7. The method (10) according to any one of the claims 2 to 6, wherein the at least one elongated auxiliary structure (4) of said set has a dimension, w, in a direction perpendicular to the longitudinal center line (5) and parallel to the build plate (2) that is in a range from 2mm to 10mm.
8. The method (10) according to any one of the claims 1 to 7, wherein providing an 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).
9. The method (10) according to any one of the claims 1 to 7, wherein providing an intermediate structure (3) on top of the build plate (2) comprises: - attaching (11b) a pre-processed intermediate structure (3) on top of the build plate (2).
10. The method (10) according to any one of the claims 1 to 9, wherein the at least one auxiliary structure (4) has an open or closed shape.
11. The method (10) according to any one of the claims 1 to 10, 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.
12. A 3D printing system (20) that is configured and arranged to fabricate a 3D part (1) using an extrusion-based additive manufacturing process, the 3D printing system (20) being operatively connected with a processing unit (21) that is provided with computer instructions which, if executed in the processing unit (21), perform the method (10) according to any one of the claims 1 to 11.
13. The 3D printing system (20) according to claim 12, wherein the processing unit (21) is integrated within the 3D printing system (20).
14. 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 12 or 13.