@d2vital Bambu has a really weird stack when it comes to IOT devices. Rather than a monolithic codebase with an API endpoint, it's more of an operating system with MQTT for the communications and FTP for handling files. The only other exposure I have is with Klipper which has an API, but last I worked with it only controls a subset of what Bambu controls. I tried to build something like Bambuddy about 9 months ago except way crappier which is how I know what work is involved in this.
I think if (big if... I totally understand @martinnyhc hesitation) Bambuddy were to add support for other printers, he'd be starting from scratch pretty much on every 3D printer brand out there. Going with some kind of plugin system where he provides the hooks and kind authors write support themselves might be the way to go about this, but too often those plugins will just sully the main project's image over time.