Semi-additive circuitry with raised features using formed mandrels

A method for making a multi-layer electric circuit having raised features comprising the steps of:

• forming a mandrel having a forming surface and a raised mandrel feature,
• applying to said surface and feature an electrically conductive coating having a thickness which is thin enough to be readily separable from said surface and said feature;
• additively forming a pattern of circuit traces on said coating,
• additively depositing a conductive material raised feature on said mandrel feature,
• adhesively securing a substrate to said circuit traces and conductive material raised feature, wherein said coating thickness is thick enough to effectively block said substrate from adhering to said surface of said mandrel,
• removing said substrate, circuit traces, conductive material raised feature and coating from said mandrel such that said mandrel is readily reusable, and
• removing said coating from said traces, conductive mandrel raised feature and substrate.