CrossFill：用于连续材料挤出的具有梯度密度的泡沫结构
CrossFill: Foam Structures with Graded Density for Continuous Material Extrusion
摘要：
3D打印的制造灵活性引发了人们对设计具有空间梯度材料特性的结构的极大兴趣。在本文中，我们提出了一种新型的密度梯度结构，专门为基于长丝挤出的3D打印系统设计。为了确保高质量的制造结果，基于挤出的3D打印不仅要求结构是自支撑的，而且要求挤出工具路径是连续的，没有自重叠。本文提出的结构，称为交叉填充，符合这些要求。特别是，CrossFill是一种自支撑泡沫结构，每一层都是通过单一的、连续的、无毛刺的材料挤出路径制造的。我们的方法产生交叉填充是基于一个空间填充表面，采用空间变化的细分水平。执行细分级别的抖动以精确地再现规定的密度分布。我们证明了一些实验测试和应用程序的CrossFill的有效性。
英文摘要：
The fabrication flexibility of 3D printing has sparked a lot of interest in designing structures with spatially graded material properties. In this paper, we propose a new type of density graded structure that is particularly designed for 3D printing systems based on filament extrusion. In order to ensure high-quality fabrication results, extrusion-based 3D printing requires not only that the structures are self-supporting, but also that extrusion toolpaths are continuous and free of self-overlap. The structure proposed in this paper, called CrossFill, complies with these requirements. In particular, CrossFill is a self-supporting foam structure, for which each layer is fabricated by a single, continuous and overlap-free path of material extrusion. Our method for generating CrossFill is based on a space-filling surface that employs spatially varying subdivision levels. Dithering of the subdivision levels is performed to accurately reproduce a prescribed density distribution. We demonstrate the effectiveness of CrossFill on a number of experimental tests and applications.
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