Digital light processing (DLP) 3D printing has received increasing attention due to high-resolution printing capability, mass productivity, and cheap equipment cost. Most of all, the layer resolution less than 50 µm overwhelms 200–300 µm layer resolution of its competitive technology, filament deposition modeling (FDM) 3D printing. Despite the advantage of the high resolution, weak mechanical properties of DLP 3D printouts have limited their industrial use. One of the easiest ways to improve mechanical property is the use of multi-materials that complement each other’s weak property However, DLP 3D printing of multi-material printouts with reliable adhesion has been largely unexplored. In this study, we compared the mechanical properties of four pairs of multi-materials consisting of two different materials of the same thickness. A composition with highest modulus and ultimate strength was fixed as the first half layer, and the acrylate of the composition for the other half layer was modulated with a monomer having a functionality between 1 and 3. If the acrylate monomer’s functionality for the other half layer was less than three, the multi-material printout showed nearly averaged mechanical property of each material. We speculate that low functional acrylate with lower viscosity allows sufficient polymerization at the interface, enabling reliable adhesion. This approach that enables successful multi-material printing with improved adhesion and complementary mechanical properties will extend the use of DLP 3D printing in a broad range of industrial application that requires both sophisticated shape and mechanical strength.

数字光处理 (DLP) 3D 打印由于高分辨率打印能力、大规模生产能力和低廉的设备成本而受到越来越多的关注。最重要的是，小于 50 µm 的层分辨率超过了其竞争技术、长丝沉积建模 (FDM) 3D 打印的 200–300 µm 层分辨率。尽管具有高分辨率的优势，但 DLP 3D 打印输出的弱机械性能限制了它们的工业用途。提高机械性能的最简单方法之一是使用多种材料来弥补彼此的弱点。然而，具有可靠附着力的多材料打印输出的 DLP 3D 打印在很大程度上尚未得到探索。在这项研究中，我们比较了由两种相同厚度的不同材料组成的四对多材料的机械性能。具有最高模量和极限强度的组合物被固定为前半层，而另一半层组合物的丙烯酸酯用官能度在 1 和 3 之间的单体调制。如果另一半层的丙烯酸酯单体的官能度小于三，多材料打印输出显示每种材料的机械性能几乎平均。我们推测具有较低粘度的低官能丙烯酸酯允许在界面处充分聚合，从而实现可靠的粘附。这种方法能够成功实现多材料打印，并具有改进的附着力和互补的机械性能，这将扩展 DLP 3D 打印在需要复杂形状和机械强度的广泛工业应用中的使用。