Hi Andy,  This won't make them look like stencils -- like the 'real'
ones -- but it does work.   What you need is an old fashioned 'Daisy
Wheel' printer.  I got one for a friend of mine who needed to be able
to use his computer to print (type) on a carbon form for the police
department.

Just set up the margins and tabs correctly and then pop in the roll.
The thing will advance the roll forever and print a series of words in
a column down the right side.  You can even use it as a typewriter.
Quality is about 4000 dpi.

Regards,
Craig Smith