> 2D printers just won't cut it:
Not your off the shelf consumer stuff, no, but there are printers that could do it, for sure.
What's more, I really have no idea what the point you are trying to make by linking those images is showing. Printing designs on nails doesn't require the level of resolution your screws idea would, so it isn't really relevant.
A quick search shows an especially high resolution 3d printer released last year in May, that can print at a 20-nanometer resolution, the D4200S[1]. That's basically cutting edge, and way, way overkill to print at the resolution required to fool you after tampering with your device.
> This is why I wrote below about eventual discovery of a possible tampering and low priority of checking it in principle.
It's a given that how often someone would check something like that (not that it would be used in practice) depends on their threat model, but you used yourself in the example originally. The point was you wouldn't be doing this, and in the context of the original comments and conversation it didn't make sense as a suggestion.
> This is a strong claim without any evidence. You didn't show how to overcome it.
The problem here is your assumption that the screws are not easy to reproduce, except they are. It's a false assumption. I showed capable printers exist, in addition exist the level of precision the worlds best counterfeiters can work at and are capable of, and yes, state actors have access to such people.
> It isn't:
It absolutely is.
All your arguments, or the links you gave that imply the arguments you didn't make, are limited to using preexisting keys which is not a requirement, or existing flawed implementations, which are not a requirement. Secureboot is a standard, and you are free to use your own keys, and own implementation - if you can't write or manufacturer your own, there are still open solutions you can trust like those from pureism, and software like coreboot.
It would really be better if you make an actual argument and reference urls rather than just spamming a bunch of links FYI. I shouldn't have to open 10 tabs to understand your reasoning.
[1] https://3dprinting.com/news/nano3dprint-launches-highest-res...
