Frame for cheap difraction grating.
thingiverse
To experiment with spectroscopes, I designed a low-cost RainbowOptics diffraction grating holder. It consists of two identical halves that can be glued together using a glue gun. There's a slit at the top for easy grating replacement. This handy frame was even printed on a Prusa Mendel with an infill density of 0.3, ensuring durability and ease of use.
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