I just saw Brian Brushwood Modern Rogue video on 3D printing keys (Here) it was very entertaining to watch them get a working key but being at a locksmith shop I thought I could do better so I whipped these up in about 30 seconds.
These were cut on a CNC key cutter with software that has key data and codes for thousands of keys. This is a pic of the software with the spacing and cut depths blurred out (I actually just knew the depths from looking at Brian’s key, Kwikset are very easy to decide by eye)
And this is the machine that does the cutting, much more expensive than a 3D printer though.
TT3D 