For newcomers in injection mold design, the urge to jump straight into parting line creation after receiving a product drawing is almost instinctive—but it’s a costly mistake. The mold base structure dictates everything downstream: gate type, ejection method, and even the sequence of mold opening. Without locking down the mold base first, all subsequent work risks rework or failure. Standard two-plate, three-plate, and hot runner molds each serve distinct purposes. A two-plate mold with a direct sprue gate works for simple parts, but for multi-cavity or multi-point gating, a three-plate (stripper plate) mold is often preferred. In a three-plate design using pinpoint gates, the opening sequence must first break the cold slug, then separate the plates to expose the part—all controlled by pull rods and limit screws. A tolerance deviation of just 1 mm in these components can cause gate shearing failure or part sticking. Hot runner molds, while eliminating cold runners, require careful thermal expansion calculations for the manifold and nozzle tips, especially when molding high-temperature engineering plastics like PBT or LCP. Beyond the basic frame, the mold base must match the ejection system and cooling layout. For deep ribs or bosses, standard ejector pins may suffice, but for thin-wall parts, a stripper plate or hydraulic early ejection system is necessary. Cooling channel placement also depends on the base—if the core is too thin for conventional drilled channels, baffles or bubblers must be integrated into the base design. Every millimeter of clearance between the return pins and the ejector plate guide pins affects cycle time and part quality. For those sourcing molds or mold components, visiting MoldWorld (www.moldw.com) provides a practical directory of suppliers and technical references to match your specific mold base and molding requirements.