3D Printer Key Duplication Risk?

First the panic was printing illegal guns, now it's duplicating high-security keys. This story details how a 3D printer was used to make an exact working copy of a previously restricted mechanical key, describing the threat as “You can take a high security ‘non-duplicatable’ key and basically take it to a virtual hardware store to get it copied.”

While the threat exists, I think it is highly unlikely that it will ever be a common exploit:

1. 3D Printing titanium means a reproducing a single key costs $40 - $50 in raw material, not counting the labor required.
2. You still need physical access to a key... even to take a picture.
3. The vast majority of criminals are going to find other, more glaring, vulnerabilities to gain access. (Door prop, tailgating, etc)
4. If the door keeps me out, I just break a window/wrap a chain around the door/steal someone's keys... not make a high-tech copy.

I'm curious to get your thoughts on this.

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