Machining time is expensive, so at some point it makes a lot more sense to just pay for the tool that will produce the exact part you want for a fraction of the

Machining time is expensive, so at some point it makes a lot more sense to just pay for the tool that will produce the exact part you want for a fraction of the price. For low volume stuff Hammond Manufacturing makes a variety of plastic and aluminum boxes for electronics projects. No to mention, if you want a unique industrial design for your product to stand out then you are going to need custom tooling.