Target draft for injection molded products is 2 degrees. As little as 0.5 degree draft can be manufactured, however cost will be approximately 3x.  To get the advantages of a low draft surface use “low draft” ribs to minimize dragging during ejection.

When designing a part for high volume manufacturing add “machining locators”. These are added to castings/forging/extrusions or can be added to parts machined from billet in the first operation.  Through the machining processes they are used to “hold on” to the part. The can be cut off if needed in a final operation.

When designing a part for laser or waterjet cutting minimize “Pierces”. A pierce is where the cutting beam/jet must drill through the material. Each pieces take the same amount of time as cutting a several cm of length. In addition piercing material can damage the surface finish or affect the mechanical properties.