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Most of the major companies who make Laser cutters, make desktop versions. You can do a search for desktop laser cutter, and you'll find a several to compare against each other. I would suggest looking at what each offer, and deciding which best suits your needs based on cost, size and function.
What kind of engraving machine?
One question: what version of Ubuntu are you installing this on?Also, one place that might help (scroll down to the sudo code): http://pyqglviewer.gforge.inria.fr/wiki/doku.php?id=documentation
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