Machines and machine tools for treatment of materials and for additive manufacturing none of the aforesaid being 2D printers or for 2D printers; 3D printers none of the aforesaid being 2D printers or for 2D printers; 3D printer components of plastic and of metal for use in printing processes, namely, heat exchangers being parts of machines the aforesaid not being 2D printers or for 2D printers; Machine parts of 3D printers, namely, extruders and heated extruders, nozzles, heatsinks, cooling and heating system primarily comprised of air-cooled heatsinks, radiative heatsinks, cooling fans, pumped water cooling in the nature of pumps for machines, thermoelectric peltier combined heating and cooling elements in the nature of heat pumps specially adapted for 3D printers, electrical resistance heating elements for heating metal objects and air heating specially adapted for 3D printers, electrical inductance heating elements specially adapted for 3D printers, infra-red radiation heating system comprised of pumps for machines, heat sinks for use in machines, heat exchangers being parts of machines: machine motors; motors for 3D printers; bearings as parts of machines; heater cartridges for 3D printers in the nature of heating elements specially adapted for 3D printers none of the aforesaid being 2D printers or for 2D printers; structural parts and fittings for the aforementioned goods none of the aforesaid being 2D printers or for 2D printers