Making these type of stencils is never that easy. Even the etch-o-matic ones have problems, or so I have read on various knife forums. Their process needs the film, a developer for the film, a positive for the film, a UV light source, a chemical electrolyte and a power source of suitable amps/volts.

You can make the positives easy enough by using a hi-def ink-jet printer to print onto suitable transparent film. This is then sandwiched with the light-sensitive paper and exposed to UV light (you have to experiment to find out how long) then developed and fixed. You can buy the film - it's quite costly, but you can make a lot of negatives from it. Graphic Art Supply houses carry it. What you don't want is full-spectrum film, like you would use in photography - you want a graphics art type film that really only processes out to black.

YOu will have trouble securing the negative to a curved surface like the hollow of a razor. If it is not in intimate close contact, the edges will be blurred instead of crisp.

Regards,
Neil