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How do you mean? It's not a line, but a scanning beam. I'm not expecting to cut steel bars in any event; more likely acetal for starters.

One of my far-too-many projects is to use the rotating-mirror and beam guidance assembly from a laser printer to make a linear cutter. That is, use the mirror and the existing lenses (plus the very-handy aperture shield!) with a high-power diode suitable for cutting. The lenses are already...