:: Why won't an on demand label printer suffice?  Put a thermal
:: transfer
:: label (ie, not temp sensitive) printer where you need the marking
:: done
:: (or carry the battery operated portable label printer) and just
:: press
:: a button for another label.

Or, why not get something along the lines of an ancient inkjet printer 
that allows access to the ink cartridge the old BJ200 /HP 500 series 
springs to mind.

Another idea, which could get a PIC involved is to grab one of those 
cartridges, and drive it directly via a microcontroller. Would only 
need to be the size of the cartridge plus a very small board and 
power.

I think some one did this and produced an article in Elektor a couple 
of years back.

Surplus product packing printers would also do what you want.

Colin
--
cdb, colin@btech-online.co.uk on 19/08/2008
 
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