I had an idea to make a program for my Arduino Uno that beeps whenever a print is done, but I can't find anything about interfacing it with the printer as all Google gives me is stuff about making a 3D printer from an Arduino.
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Yes you could. But, as an alternative to the Arduino Uno, it might be far easier to send a beep by G-code M300 (or here for Marlin firmware), this will bypass the need for an Arduino Uno entirely. You can even play the soundtrack/theme of Beverly Hills cop from this previous answer.
You can add the (set of) G-code(s) to the "end G-code" in your slicer.
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$\begingroup$ I can't find a way to add a custom script at the end in cura $\endgroup$ Sep 14, 2021 at 16:21
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$\begingroup$ In Cura, go to your printer configuration and change machine settings, add code in the end G-code script. $\endgroup$– 0scar ♦Sep 14, 2021 at 20:37