Nineteenth century 3D printing, a process called stereotyping using electrolysis to make an exact copy of an object. The first picture is the artefact and the copper stereotype made of it. The second is of the mould made of it in latex. The mould is made conductive with graphite and placed in a frame to hold in place in the electrolysis tank. The electrolytic process plates the graphite with copper making a perfect copy of the original artefact.