Method of designing a part for additive manufacturing (am) that will increase part accuracy and reduce the need for post processing

A part, comprising:

• an opening for receiving an insert, the opening including an internal surface having a plurality of facets, wherein:
• the opening has a cross-sectional area having a first cross-sectional area larger than a second cross-sectional area of the insert,
• the insert comprises an outer contact surface,
• the facets each comprise a plane tangent at tangent points to the outer contact surface,
• the facets constrain the insert so as to locate the insert in the opening when the insert is inserted into the opening, and
• the tangent points are the only contact points between the internal surface and the outer contact surface

A computer implemented system for manufacturing a part, comprising:

• one or more processors;
• one or more memories;
• and a program stored in the one or more memories, wherein the program executed by the one or more processors:
• generates a data file for controlling an apparatus manufacturing a part having an opening for receiving an insert, the data file including dimensions and a shape of an internal surface of the opening, the dimensions and the shape defining the internal surface having a plurality of facets, wherein the opening has a first cross-sectional area larger than a second cross-sectional of the insert, the insert comprises an outer contact surface, the facets each comprise a plane tangent at tangent points to the outer contact surface, the facets constrain the insert so as to locate the insert in the opening when the insert is inserted into the opening, and the tangent points are the only contact points between the internal surface and the outer contact surface of the insert.