Homebrew PCBs

Hi,

i've read some time ago an article about o guy using a matrix printer
to puncture some sort of foil in order to use it as a masking stencil
for making soldermasks on pcb. I tryed to find that page again, with
no result. Does anyone knows about this ? I'm starting to experiment
with this... but i'd like to have something to start from...

thanx,
Mihai