Wondering something, Can you get wireguard client to only be used for HA app and leave everything else threw normal routing on your phone? (Not sure I have proper wording). So that wireguard will always be on but only being used for HA app

Will check that, thanks

I don't have any but I've seen reolink mentioned a lot, cheaper would be tapo camera (what I have), I know some tapo have baby cry alert but don't know if this function works with hacs component. For Tapo, once setup inside app you can block internet access to the camera threw your router or else. https://github.com/JurajNyiri/HomeAssistant-Tapo-Control

I don't see why you think those are web based, usually people run this at home but glad you find what you are looking for

I have nvme setup on my pi 4 (I know it's overkill for that purpose but already had pi setup like this prior to klipper), that being said I will definitely look at getting one with communication control even if power never goes down for more than a couple of seconds

If you make a search "ender 3 5v pin", you will find plenty of examples on Reddit, octoprint forum and others. Problem was (or is) that printer was still getting power when OFF, it could lead to plenty of issues with worst case scenario where the mainboard died.

Just adding to your comment that if OP goes that route, he will need to cover 5v pin with some electrical tape on usb otherwise he will wreck is printer board. (Unless recent ender 3 have this issue fixed but I doubt)

If I recall correctly, chances are they are coming this year

Unless you want some specific schedule, there is no need for automation, add config to yaml and it is good to go

Is the base hollow? If yes, you can put a ZigBee module