Small plastic parts can be expected to hold up under large loads.Insights into strengthening a part is by adding one or more “ribs” to the design
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Design for Injection Molding Guidelines-DFMPro for IM Design
Rules for Using Ribs to Strengthen Plastic Injection Molded Parts
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Injection molding: The manufacturing & design guide
Rules for Using Ribs to Strengthen Plastic Injection Molded Parts