A liquid dispensing module and nozzle or die tip for discharging at least one liquid filament. Four coupling windows 33bc1, 33bc2, 33bc3 and 33bc4 are provided between a resonant region 51b and a resonant region adjoining the resonant region 51b. The method also includes phase shifting the outputs of the plurality of parallel amplifiers, wherein phase shifting transforms the second output impedance into a third impedance that is higher than the second output impedance, and combining the phase shifted outputs. In addition, the base includes a locking mechanism in order to normally lock the cover to the base so that it cannot be readily disengaged by the consumer. The articles so formed may be disposed on substrates, and may form an electrical network of nanotubes within the article itself. On the filter cavity, a suction connection is provided, via which the cleaned fluid can he discharged by way of a suction pressure corresponding to a system operating pressure.