A microstructure from the 3D printer: almost a millimeter long (or high, as in the photo) is the new refractive structure that was developed by PSI scientists and, in combination with a diffractive element, results in an achromatic X-ray lens. Turned on its end, it resembles a miniature rocket. It was made from a special type of polymer by a 3D printer. This picture of the structure was taken with a scanning…