The article covers a part of the PhD research on sheet metal stamping with elastic media. Calculations have confirmed that stamping with elastic media is much cheaper than traditional punching technology. Nevertheless the weak point of the stamping with elastic media is the relatively large technological wastage size deriving from the need to support forces to hold technological bridges. The metrological achievements allow for the creation of a 3D surface roughness model for the working surfaces of the stamp. In its turn, this 3D surface roughness model can help reduce technological wastages. By knowing the surface friction dependence between sheet material, base plate and elastic area, it is possible to calculate the precise minimal size of the technological bridge.