[lambda]

No, if you can make a 3D printed model of it, you can CNC mill it. Sure, a CNC milling machine is a bit more expensive than the cheapest 3D printers, but anyone who wants can find a machine shop nearby that will mill something for them, or just send it off to some place online like eMachineShop to get it done.

[TylerE]

and actually, it's not even that much more expensive. You can get a CNC Sherline mill for something like a $1500. Sure - the work area is small, they're mainly aimed at e.g. model builders, but it's big enough for something like this, and they're real honest to goodness CNC precision machine centers.

[meatysnapper]

or a blank and a file. these are not big keys.