ABS samples were prepared by fused deposition modeling (FDM) 3D printing and traditional molding,respectively.The effects of two molding methods on the tribological properties and wear mechanism of ABS samples were compared by balldisk friction test.The differences in tribological properties of ABS samples prepared with different print layer thicknesses (0.1,0.2,0.3,0.4 mm) were investigated.The results show that the ABS samples prepared by FDM have higher wear and lower friction coefficient than that by traditional molding.The dominant wear mechanism of the FDM samples is adhesive wear,while the wear mechanism of the molded samples is mainly abrasive wear.For FDM samples,the printed sample with a layer thickness of 0.2 mm exhibits better tribological properties,which is because the top layer of the sample can be easily abraded if the printing layer thickness is too low,while if the printing layer thickness is too high,the adhesion force and density of the sample will be reduced,and the wear resistance will be reduced.It is found that the oxidation performance and molecular structure of each sample by two molding methods are basically the same based on the DSC experiment and infrared spectra measurement,which indicates that different molding methods did not change the microstructure of the material.