A Michelson interferometer, a precision optical instrument for measuring minute changes in path length, can now be built at home using 3D printing for around $20. The design uses 3D-printed mirror mounts with springs and thumbscrews, requiring only basic hardware, a laser, mirrors, and a beam splitter. The device can theoretically detect distance changes as small as 650nm (one laser wavelength), making high-precision optical measurement accessible to hobbyists and makers.
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