9.1 Occasionally I have to abort a print job. Turning off the printer does not get rid of what is in the HP3000 printing buffer. Is there a way to empty the buffer so that when I turn the printer back on I don't waste any paper?

From Wirt Atmar (paraphrasing a stanza from the Edward Fitzgerald translation of the "Rubaiyat of Omar Khayyam"):

No. Once the moving finger writes, not for all your piety, nor all your wit, can you erase half a line of it.

Fortunately, however, some recent HP LaserJet models finally provide a "Cancel Job" function that you can invoke from the front panel which will drain all the remaining data in the job into the bit bucket for you.