Do not skimp on the design
Some shops do not have an in-house designer and must outsource their design work. This is fine and works quite well- unless the boss decides to save money by cutting costs on the design. This is just asking for trouble.
Even with high-quality mold design, building an injection mould is fraught with potential problems. When the design is faulty or missing details it can eat up the profit margins very quickly. For example a simple feature like radii that interfere in a shut-off area can be very time consuming to troubleshoot and handwork at the end of the job.
The fit of precision holes to their components is another rather common omission in mold designs as well. Often this does not show up until assembly, at which time the mold maker must make new components or modify existing ones.
Another overlooked area is the draft angles of molding surfaces. The mold maker might not question the design when no draft is specified, and as a result, the part will not eject in molding. Draft angles are obviously much easier to the machine before the mold is finished!
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