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Made sure the stock firmware printed the example gcode that came on the SD card and then immediately embarked on my journey to get klipper running on this guy.
I didn't finish until the wee hours this morning so I've yet to really give it a go but all the essentials are operational.
Here's the GitHub link to the config I created: https://github.com/0xD34D/ender3-v3-se-klipper-config
klipper is the firmware flashed to the printer
gui is achieved and accessed through mainsail or octoprint. I haven't tried octoprint.
mainsail runs on a raspberry pi and can manage multiple klipper printers with one device. you can also add klipperscreen, it's an addon that can be used with a touchscreen for an interface at the printer (or anywhere really)...
but I just access mine running mainsail through my phone browser or the laptop I use to model and slice. I like orcaslicer because it integrates mainsail right into a tab in the slicer and provides a seamless user experience.