A dual-contact tool holder is provided for a lathemiller, including a tool seat having an inner circumferential surface in which a circumferential groove is defined and an operation barrel having a circumferential surface in which holes are defined for receiving therein steel balls. The method includes adjusting the temperature of the mixture, either by heating or cooling, to bring the temperature to a temperature at which decombination of the polymer mixture occurs. The inverter boards 20 are arranged on a side of the chassis 14 opposite from the cold cathode tubes 18. A nozzle is positioned within the housing and includes a central passageway having an open end and disposed in fluid communication with the powder container.