This is a parameterized version of Adrian's printable inkjet head. It is configured for 20mm piezo disks. Dec 18th, 2010 Added support for second o-ring (Adrian's change). Adjust height of body if second o-ring used. Remove clamp cutout if second o-ring used. Reposition bolt holes so they are equidistant from the piezo and body walls. Automatically compute tube clamp width.It has still not been printed and tested. Construction instructions are essentially the same as for the original (see http://reprap.org/wiki/Reprappable-inkjet), except that it is intended that a single o-ring be used. Also, as configured it is assumed that a 20mm piezo and 18mm o-ring will be used. I hope to print and test a sample late next week, at which point I'll update this with any necessary changes.