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Point is, they do indeed make a nice etching machine and at a low cost. One thing I have found, is multiple "contacts" of short duration is better. In other words, 5 three seconds with the pad in contact with the stencil is better than one 15 second or even 3 five second contacts. Seems the longer contact times damages the stencil and shortens the number of etches per stencil. Maybe heat buildup? Dunno. 12 volts is a lot. The steel will etch with half that voltage. But a 12 volt is what I could find and what I use. I just use it at multiple short contacts.
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