Additive manufacturing techniques form an object by accumulating layers of material on top of one another. Each layer has to be supported by the one below for the fabrication process to succeed. To reduce print time and material usage, especially in the context of prototyping, it is often desirable to fabricate hollow objects. This exacerbates the requirement of support between consecutive layers: standard hollowing produces surfaces in overhang that cannot be directly fabricated anymore. Therefore, these surfaces require internal support structures. These are similar to external supports for overhangs, with the key difference that internal supports remain invisible within the object after fabrication. A fundamental challenge is to generate structures that provide a dense support while using little material. In this paper, we propose a novel type of support inspired by rib structures. Our approach guarantees that any point in a layer is supported by a point below, within a given threshold distance. Despite providing strong guarantees for printability, our supports remain lightweight and reliable to print. We propose a greedy support generation algorithm that creates compact hierarchies of rib‐like walls. The walls are progressively eroded away and straightened, eventually merging with the interior object walls. We demonstrate our technique on a variety of models and provide performance figures in the context of fused filament fabrication 3D printing.

中文翻译：

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用于空心物体 3D 打印的罗纹支撑拱顶

增材制造技术通过在彼此之上堆积材料层来形成物体。每一层都必须得到下面一层的支持，制造过程才能成功。为了减少打印时间和材料使用量，尤其是在原型制作的背景下，通常需要制造空心物体。这加剧了对连续层之间支撑的要求：标准镂空产生无法再直接制造的悬垂表面。因此，这些表面需要内部支撑结构。这些类似于悬垂的外部支撑，主要区别在于内部支撑在制造后在物体内保持不可见。一个基本的挑战是生成在使用很少材料的情况下提供密集支撑的结构。在本文中，我们提出了一种受肋骨结构启发的新型支撑。我们的方法保证在给定的阈值距离内，层中的任何点都得到下面的点的支持。尽管为可打印性提供了强有力的保证，但我们的支撑件仍然保持轻便且打印可靠。我们提出了一种贪婪支持生成算法，可以创建肋状墙的紧凑层次结构。墙壁逐渐被侵蚀和拉直，最终与内部物体墙壁合并。我们在各种模型上展示了我们的技术，并在熔丝制造 3D 打印的背景下提供了性能数据。我们的支架重量轻，打印可靠。我们提出了一种贪婪支持生成算法，可以创建肋状墙的紧凑层次结构。墙壁逐渐被侵蚀和拉直，最终与内部物体墙壁合并。我们在各种模型上展示了我们的技术，并在熔丝制造 3D 打印的背景下提供了性能数据。我们的支架重量轻，打印可靠。我们提出了一种贪婪支持生成算法，可以创建肋状墙的紧凑层次结构。墙壁逐渐被侵蚀和拉直，最终与内部物体墙壁合并。我们在各种模型上展示了我们的技术，并在熔丝制造 3D 打印的背景下提供了性能数据。