The potentiality of the Fused Deposition Modeling (FDM) process for multi-material printing has not yet been thoroughly explored in the literature. That is a limitation considering the wide diffusion of dual extruders printers and the possibility of increasing the number of these extruders. An exploratory study, based on tensile tests and performed on double-material butt-joined bars, was thus conceived; the aim was to explore how the adhesion strength between 3 pairs of filaments (TPU-PLA, PLA-CPE, CPE-TPU) is influenced by the material printing order, the type of slicing pattern used for the layers at the interface, and the infill density of the layers below the interface. Results confirm the effectiveness of mechanical interlocking strategies in increasing the adhesion strength even when thermodynamic and diffusion mechanisms of adhesion are not robust enough. Besides, thermal aspects also demonstrated to play a relevant role in influencing the performance of the interface.

融合沉积建模（FDM）工艺用于多材料打印的潜力尚未在文献中得到充分探讨。考虑到双挤出机打印机的广泛普及以及增加这些挤出机数量的可能性，这是一个局限。因此，设想了一项基于拉伸试验并在双材料对接钢筋上进行的探索性研究。目的是探索材料对印刷顺序，界面层使用的切片图案类型以及表面张力对三对长丝（TPU-PLA，PLA-CPE，CPE-TPU）之间的粘合强度的影响。界面下方各层的填充密度。结果证实了机械联锁策略在提高粘合强度方面的有效性，即使粘合的热力学和扩散机理不够牢固。此外，散热方面也显示出在影响界面性能方面的重要作用。