Not to take anything away from the OP engrave, which is very cool… I just wonder a bit about using QR codes like this.
If it’s not security measure, then wouldn’t a sign with the ssid and password in plaintext be more convenient, since it would work for everyone without any fuss?
I mean you could still QR it too — there is nothing stopping you from having both the QR and plaintext on the same sign — but QR isn’t widely adopted even now, and I generally don’t want to load QR codes in case they take me to some site I don’t want to visit.
Anyhoo. Nice engrave anyway, and nicely done to enhance the contrast.