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Fifty diffraction gratings are about to be delivered to Ukraine. A warm thank to the private groups from Eastern Europe who realized the importance of these free, easy to use small devices.
Our diffraction grating frames stock has been renewed. 500 pieces are now available.
Order your diffraction grating slide and go to the hunt of UFO’s spectrums. Several methods are available to get yours at low cost. The diffraction grating remains as free.
After a month spent going back and forth with a Professional 3D Printing Society, and some modifications in order to decipher as