Most current additive manufacturing (AM) processes are layer based and contain several drawbacks. For example, parts can only be printed with a range of motion limited to the X, Y, and Z axes. Therefore, Computer Numerically Controlled Accumulation (CNC-A) is created as an additive manufacturing method that does not print layer by layer. By converting a three-dimensional model into two-dimensional layers, the process planning can be dramatically simplified. By incorporating multi-axis tool motion, the CNC accumulation process can be beneficial for applications such as plastic part repairing, addition of new design features, and building around inserts.