Clearly the only right answer is Internet. Who cares about camera, mic or location when the app cannot send the data anywhere anyways?

No it’s not. The last commit was 2 weeks ago as well as the last release

Bambulabs Slicer is open source, idk about the firmware

Bamulab X1C (1.6k€ i think) is great but idk if it fits your requirements. Has literally every feature one would need