[lenkite]

> because the bare metal scratched my fingernails.

Nice multi-purpose titanium laptop. You can even trim your fingernails on the same!

[thaumasiotes]

It would be less effective than a file, since there's just the one point on the sharp edge of the laptop.

Most people are not looking to scuff up the face of their fingernails, which is what happens when you handle such a laptop naturally.