"Cooling Fan Manufacturer" cavity and core [3] points of injection mold design is the key to the design, including the parting line design, sub-surface design, extraction typing area, generating core and cavity and other steps. "Cooling Fan Manufacturer" Governor top surfaces of the cover model for a speed control knob hole, there is a row of cooling down the side of the slot, during the parting design, you must first fill those holes slots, otherwise it will not carry out a design, can not generate the core and cavity. Injection mold wizard [mold tool] and entities with a surface patch repair capabilities, the use of [mold tool] the surface patch to patch the hole slot products. Click [Surface Patch], in "Cooling Fan Manufacturer" governor superstructure model choose to include speed control knob hole and surface cooling slots within the article, after the completion of repair hole slots OK.