Design Guidelines for Injection Molding
Plastic injection molding is the most common way to mass produce parts. Injection molding is great if you want to produce the same item over and over again. There are two main reasons why it is so popular: first, after an initial investment in a mold, it is the lowest cost par part; second, since the part comes out of a fixed mold, the parts are very repeatable with very accurate results. There are other reasons for its popularity as well: minimal scrap, low energy usage, and limited need for post processing.
RevPart provides a deep dive into information on how to design for injection molding and expert recommendations that will save you time and money.