If you can get your hands on an old pen plotter, you might be able to put an inexpensive Roland vinyl cutter head into it. Inkscape has offset drag compensation for at least some plotters.
Then you could try cutting solder paste stencils from mylar sheets.
This might also work with one of those relatively inexpensive laser diodes that are generally sold as add-ons to CNC machines. They are quite a bit heavier than a pen, so a pen plotter would likely need the acceleration and speed settings adjusted. Which is part of using a laser diode, anyway.
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Steven Greenfield AE7HD
Steven Greenfield AE7HD