A droplet generator and ink jet printhead assembly employing the droplet generator are disclosed. The droplet generator can operate with a wide range of fluids over a wide range of conditions, is easily serviced, and can be easily integrated into a machine such as a Three Dimensional Printing machine....http://www.google.de/patents/US6070973?utm_source=gb-gplus-sharePatent US6070973 - Non-resonant and decoupled droplet generator
