I have designed a letterhead with headers and footers, but all the printers where it will be printed have completely different margins...is there any way I can code the header and footer to print to each individual printer as far as possible on the margins?

Not exactly. The best solution is probably to prepare your letterhead for the most restrictive printable area setting and use that.

Word has "margins." Those do not change depending on the printer. Printers do have printable areas, and those may be smaller than the margins set in Word.

You can associate the document with a particular printer that prints it as you want, assuming that printer is available to all that use it.

http://www.gmayor.com/Associate_Printer.htm

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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com