Draft Requirements

Draft is necessary on surfaces parallel to the direction of the die draw because it facilitates the ejection of the part from the tool.
It is not common practice to compute the draft angle for each feature on a component, and it is normally generalized with some exceptions
Twice as much draft angle is recommended for inside walls or surfaces as for outside walls or surfaces
This is because the alloy solidifies and shrinks onto the features that form the inside surface and away from the features that form the outside surfaces.