Octoprint is such a huge improvement to the 3d printing experience, combined with some custom Marlin firmware, it drives status messages on the build in display

Octoprint is such a huge improvement to the 3d printing experience, combined with some custom Marlin firmware, it drives status messages on the build in display, it shows detailed error messages on the web interface, the plugin ecosystem is incredibly robust, and being able to have the webcam feed on a separate monitor to watch for failures while I'm working are invaluable. I don't think I'd want to use my 3d printer without it.