Lee Brian J, Hsiao Kaiwen, Lipkowitz Gabriel, Samuelsen Tim, Tate Lee, DeSimone Joseph M
Department of Radiology, Stanford University, Stanford, CA, 94305.
Department of Mechanical Engineering, Sungkyunkwan University, Suwon, Republic of Korea.
Addit Manuf. 2022 Jul;55. doi: 10.1016/j.addma.2022.102800. Epub 2022 Apr 1.
Resolving microscopic and complex 3D polymeric structures while maintaining high print speeds in additive manufacturing has been challenging. To achieve print precision at micrometer length scales for polymeric materials, most 3D printing technologies utilize the serial voxel printing approach that has a relatively slow print speed. Here, a 30-µm-resolution continuous liquid interface production (CLIP)-based 3D printing system for printing polymeric microstructures is described. This technology combines the high-resolution from projection microstereolithography and the fast print speed from CLIP, thereby achieving micrometer print resolution at x10 times faster than other high-resolution 3D printing technologies. Print resolutions in both lateral and vertical directions were characterized, and the printability of minimum 30 µm features in 2D and 3D has been demonstrated. Through dynamic printing optimization, a method that varies the print parameters (e.g. exposure time, UV intensity, and dark time) for each print layer, overhanging struts at various thicknesses spanning 1 order of magnitude (25 µm - 200 µm) in a single print are resolvable. Taken together, this work illustrates that the micro-CLIP 3D printing technology, in combination with dynamic printing optimization, has the high resolution needed to enable manufacturing of exquisitely detailed and gradient 3D structures, such as terraced microneedle arrays and micro-lattice structures, while maintaining high print speeds.
在增材制造中解析微观且复杂的三维聚合物结构，同时保持高打印速度，一直具有挑战性。为了在聚合物材料的微米长度尺度上实现打印精度，大多数三维打印技术采用串行体素打印方法，其打印速度相对较慢。在此，描述了一种用于打印聚合物微结构的基于30微米分辨率连续液体界面生产（CLIP）的三维打印系统。该技术结合了投影微立体光刻的高分辨率和CLIP的快速打印速度，从而以比其他高分辨率三维打印技术快10倍的速度实现微米级打印分辨率。对横向和纵向的打印分辨率进行了表征，并展示了二维和三维中最小30微米特征的可打印性。通过动态打印优化——一种为每个打印层改变打印参数（例如曝光时间、紫外线强度和暗时间）的方法，在一次打印中可分辨出跨越1个数量级（25微米 - 200微米）的各种厚度的悬垂支柱。综上所述，这项工作表明，微CLIP三维打印技术与动态打印优化相结合，具有制造精致细节和渐变三维结构（如梯田状微针阵列和微晶格结构）所需的高分辨率，同时保持高打印速度。
