method and apparatus for manufacturing of pre - inkable rubber stamps from micro porous thermo - plastic material by use of thermal head , where material is compressed by not less than 0 . 5 mm and the controller switches on and off the heating elements of the thermal head in accordance with a pattern received from the computer , creating by melting the surface of the said material ink non - permeable elements , characterized in that the surface with the heating elements of the said thermal head has appropriate configuration that the stretching out of melted surface layer of the said material under the elastic tension of the material releasing from the compression by the thermal head is avoided .