This guy Les put together a piece of software to view/calibrate a spectrum[0]. He also has a YT channel[1] where he builds a couple RasPi spectrometers using pre-made spectroscopes that run $50-100, but the whole package is a lot more compact.<p>There are also a number of spectroscope enclosures on thingiverse, but it's always so hard to gauge if any of the projects are actually worth printing. The most dead-simple and cheap example I found used the same slit/CD plastic combo capped onto the ends of a paper towel tube.<p>Some other stuff[2,3,4]<p><a href="https://github.com/leswright1977/PySpectrometer" rel="nofollow">https://github.com/leswright1977/PySpectrometer</a><p><a href="https://www.youtube.com/watch?v=jAV7bnNrE-M" rel="nofollow">https://www.youtube.com/watch?v=jAV7bnNrE-M</a><p><a href="https://physicsopenlab.org/2021/06/19/absorption-spectroscopy/" rel="nofollow">https://physicsopenlab.org/2021/06/19/absorption-spectroscop...</a><p><a href="https://www.effemm2.de/spectragryph/about.html" rel="nofollow">https://www.effemm2.de/spectragryph/about.html</a><p><a href="https://en.wikipedia.org/wiki/Absorption_spectroscopy" rel="nofollow">https://en.wikipedia.org/wiki/Absorption_spectroscopy</a>