Which manufacturers are you talking about? The ones making the electronics without firmware? The open source firmware which anyone can install or modify? The open source web interface that anyone can install or modify? The open source slicers where anyone can use any slicer they wish to (and also are used to generate gcode used on multiple different machines)?
There is simply no point in this chain where something like this would be enforceable
Fluctuations in layer height that are not visible? Dude, most printers are not even able to achieve a layer height consistency that would be invisible to the naked eye if they wanted to.
This usecase should work fine. Seeing that it also works with the anker powerbank, maybe your ugreen powerbank is the issue and doesn’t have a proper implementation
The Fujitsu Futro S740 are quite nifty little devices which can be found for around 50-60€ on the used market. They use <5W at idle and have more compute power than a raspberry pi 5.
Every single 3d printed part that is ever produced? Who should add the serial number? Are steel pipes from the hardware store also serialized?