Sometimes, however, injection-molded plastic parts need a little help. Low impact or vibration resistance, slippery surfaces, poor ergonomics, and cosmetic concerns are just a few of the reasons why a second molded part is often added as a grip, handle, cover, or sleeve.
Some manufacturers choose to assemble these two different molded components together with glue, screws, or an interference fit, but this takes time and costs money, and may lead to less-than-desirable results. Fortunately, the process of multi injection molding offers an alternative solution.
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