Abstract: 3D printing technology provides multi-scale, multi-material and multi-dimensional manufacturing capability for microwave absorber, which is beneficial to take advantage of the combination of material loss and structural loss. In this work, a three-layer periodic crisscrossed structural microwave absorber was fabricated by using FeSiAl-MoS₂-graphene (GN)/polylactic acid (PLA) composite filaments, and the effects of the geometric parameters of the unit cell and the combination of materials of each layer on the absorption performance of the complex structural absorber were investigated. The effective absorption bandwidth (EAB, for reflection loss R_L≤−10 dB) of the absorber was 12.7 GHz when the graphene content of dielectric layer, absorption layer and matching layer was 0wt%, 5wt% and 4wt% in turn. At the same time, the EAB value were greater than 10 GHz when the incident angles of transverse electric wave (TE polarized wave) and transverse magnetic wave (TM polarized wave) were less than 40° and 70°, respectively. This study provides a theoretical and applied basis for the design and manufacture of wide-angle and broadband wave absorbers due to the experimental results are basically consistent with the simulation results.