The earliest "improved" drop technology (1984 version, improved Zoltan style, nozzle) Droplet Ejecting System for tiny drops of hot-melt materials for 3D Printing. This piezo-acoustic technology started the "Inkjet" jewelry investment casting 3D Printing era in 1994. This self-contained 120C heated body (printhead) requires 120C heated liquid-wax from a custom made heated fluid-line, attached to a 120C heated-reservoir of wax material, positioned with 1/4 inch negative fluid pressure for flow to the nozzle hole. Few people can relate to this technology but this is your chance to own one of these printheads that has sold for $1200. True! Your interest is to see how it is made. Take it apart. Investigate the technology by reading the Zoltan and Helinski Patents included with this printhead. Your can also read about it on line. Research stories about 3D Printing on Wikipedia.org.
I am selling these expensive printheads to encourage you to challenge your mind. Learn something very hi-tech. Write about it in school. The nozzle is made of Tefzel and is very soft. The hole or orifice to is about 0.004 inches in diameter. There is a screen filter behind the jet module to filter out particles bigger than 15 microns. The rubber side plug is removed to burp out air when the heated printhead is filled with wax. Minimum operating temperature is 110C and Maximum temperature is 125C. The mother 3D printer for this device controls temperatures and has a procedure to fill in a proper sequence (not included). Consider this, an experiment of curiosity. When operating correctly the wax fluid is actually expelled by sound waves. It was originally piezoelectrically driven with a square wave pulse of about 60 volts. The leading edge of the pulse triggers the sound wave and and the lagging edge reinforces the sound wave to expel one drop per pulse. It was capable of shooting 16,000 drops per second when working. I hope you enjoy learning about it. It may also be purchased by printer owners who may fix it themselves and save lots of money. (this requires heating and cleaning out the old wax)