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Undercuts

External undercuts as shown in Figure 9 can be readily formed on a parting line using a split mold; where additional mold members are required to produce them, tool costs are increased and production rates decrease. Some internal undercuts can be produced using slides while some others may be molded through the use of collapsible cores. The added costs and potential flashing problems that may ensue in these cases dictate avoidance of internal undercuts in most MIM designs.