i print mine on paper then pin or tape them to the top. years ago, i bought a box of 15 lb pin-feed computer paper. i tear off the perforations, take out the carbon paper (which i've used to trace patterns onto fabrice for painting) and run it through the printer. i can make "stencils" up to 16.6" x 16.5" (have to make 4, line them up and glue or tape together.) I just bought a new printer that can take paper up to 14" wide. Bigger stencils are now possible. Yippee! Yahoo!
Does anybody know where to buy blank newsprint paper? i'll bet that would tear away even more easily than the 15lb stuff, which is almost gone.