Laser Diffraction Pattern Cap

This cap is used to create a laser diffraction pattern. Print it and then stretch a thin material across the end. Use glue to retain the line. Fit the cap on the end of a laser pointer and point it at a screen such as a white wall. The cap can be resized for various size laser pointers.

More Detail
https://www.olympus-lifescience.com/en/microscope-resource/primer/lightandcolor/interference/