In his quest to develop his own cryocooler for liquid nitrogen production, the author has come across various interesting topics. One such exploration is the use of dry ice for pre-cooling, which led him to ponder the process of making dry ice from scratch. While obtaining the CO2 required for dry ice is relatively simple using baking soda and an acid, other methods such as yeast or capturing exhaled air prove to be more complex. The author describes the steps involved in creating dry ice, involving compressors and repurposed paintball tanks. Despite the cost and effort involved, buying dry ice from a store is still the more convenient option. However, the author’s experiment yielded fascinating results unlike previous attempts.
https://hackaday.com/2023/03/10/making-dry-ice-at-home-is-just-as-hard-as-it-sounds/