The rapid development of fused deposition molding(FDM)3D printing has brought new opportunities for multi-material 3D printing of filament-like consumables.This paper first introduces the application of FDM 3D printing technology,and then deeply discusses the advantages of multi-material 3D printing.In terms of optimizing printing parameters of a single material,multi-material 3D printing is an effective way to improve the performance of printed parts and print multi-functional grading materials.Through a systematic review of the current research related to multi-material FDM 3D printing,it is found that the quality of multi-material interlayer bonding is the most important feature affecting the strength and performance of printed parts.In addition,the effects of single-nozzle and multi-nozzle feeding systems on the quality of interlayer bonding and the challenges in practical applications are compared.Finally,the paper concludes that multi-material FDM technology provides an efficient way to create complex structures and meet specific load-bearing requirements by combining the advantages of different materials,thus expanding the innovation and optimization potential of additive manufacturing.
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