Additive manufacturing, particularly with UV-curable resin-based 3D printing, has revolutionized production processes, allowing precise fabrication of intricate geometries. However, challenges persist in composite printing, particularly in meeting the demand for second-life applications due to the considerable volume of carbon fiber waste. This study addresses this issue by researching the compatibility of mechanically produced recyclable carbon fibers with UV-curable resin. The short carbon fibers were combined with the resin at varying weight percentages (1.5, 3, 6, 9, 12, and 15 wt.%) to determine the optimal ratio for achieving maximum Young’s modulus and tensile strength in resulting composites. Utilizing digital light processing (DLP) 3D printing technology, the study systematically evaluated composite roughness, surface hardness, and voids volume. Each 3 wt.% increase in recycled carbon fiber concentration within the UV-curable resin resulted in a 0.01 g/cm³ density decrease, accompanied by a 0.02 µm increase in surface roughness, with no impact on hardness. Notably, the 3 wt.% concentration proved optimal, exhibiting a 27% increase in Young’s modulus and a 44% increase in tensile strength compared to the pure resin.

增材制造，特别是基于紫外线固化树脂的 3D 打印，彻底改变了生产工艺，可以精确制造复杂的几何形状。然而，复合材料打印仍面临挑战，特别是由于存在大量碳纤维废料，在满足二次使用的需求方面尤其如此。本研究通过研究机械生产的可回收碳纤维与紫外线固化树脂的相容性来解决这个问题。将短碳纤维与树脂以不同的重量百分比（1.5、3、6、9、12 和 15 wt.%）混合，以确定在所得复合材料中实现最大杨氏模量和拉伸强度的最佳比例。该研究利用数字光处理（DLP）3D打印技术，系统地评估了复合材料的粗糙度、表面硬度和空隙体积。 UV 固化树脂中回收碳纤维浓度每增加 3 wt.%，密度就会降低 0.01 g/cm ³，同时表面粗糙度增加 0.02 µm，但对硬度没有影响。值得注意的是，3 wt.% 的浓度被证明是最佳的，与纯树脂相比，杨氏模量增加了 27%，拉伸强度增加了 44%。