Results in Table 8 confirm that considering a sub-set of all possible molding patterns may generate sub-optimal solutions, since that solutions provided for all the 12 instances by the proposed model are better than the solutions of the GLSP approach. On average,the proposed model provided solutions with total costs 21.34% lower than the GLSP solutions. The best case was for instance 11, where the cost of the solution provided by model (1)–(19) was approximately 49.7% lower than the provided by the GLSP.