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With the revolution of additive manufacturing (AM), researchers are working to adopt the benefits of AM for manufacturing flexibility and reduced wastage, which are some of the disadvantages of subtractive manufacturing. AM has introduced design flexibility during manufacturing of fiber reinforced polymer composites with complex geometries and varied internal structures. AM allows designing orientations and percentages of reinforcement fiber to achieve desired mechanical properties of parts. To obtain a high level of surface finish and tolerance, machining is still considered as a post-processing technique for 3D-printed composite parts. Finite element analysis (FEA) is a widely used numerical analysis tool that has the capability of revealing the physics of failure mechanisms of fiber, matrix, and interface during machining of polymer composites. A commercially available powerful FEA software ABAQUS/Explicit package has been used in this study. The objective of this research is to investigate the post-processing machinability of AM-CFRPs with various make strategies, infill patterns, layer widths and orientations. The machinability of AM-CFRPs has been compared to that of traditional laminated CFRP composite to understand how AM process adds further challenges during machining or post-processing of CFRPs. The effect of different machining conditions like variation in depth of cut was also studied to understand the machining behavior as well as failure mechanisms of additively manufactured carbon fiber reinforced polymer composites during post-process machining.