I made one that is a bit more solid and (slightly) more expensive with a PVC tube and a diffraction grating a few years ago: https://thomasmansencal.blogspot.co

I made one that is a bit more solid and (slightly) more expensive with a PVC tube and a diffraction grating a few years ago: https://thomasmansencal.blogspot.com/2014/07/a-homemade-spectroscope.html https://thomasmansencal.blogspot.com/2014/07/a-homemade-spec.... With a good DSLR camera, it produces really nice spectra. There is a companion repository to slice and undistort the spectra given known emission lines: https://github.com/colour-science/colour-spectroscope https://github.com/colour-science/colour-spectroscope