The laser cutter head. The beam comes in from the left near the top and is reflected downward by the diagonal mirror. Lower in the vertical black tube is the lens, made of a special material that’s transparent to infrared light. The black rubber hose on the right delivers compressed air, which sprays out the black nozzle at the bottom, along with the laser beam. The golden contraption on the left is a mechanical height probe for autofocus.

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