Key duplicator / copier

I remixed this to use a 8mm shaft to prevent chatter and create better keys.
The photos show a commercial product that I used as inspiration for the mods.

You could use a long bar, a bolt, or even an old z axis screw. Z screw was my plan. Get fancy and put in 8mm bushings and a smaller pivot rod. The rod file is included if you want to go the really cheap route.
I also added hex recesses to put a nut on the key holding screw. Avoids issues of stripping out the printed threads.

I have not printed this and probably won't. I stumbled into a real key machine for $20. But I figured I would finish this project anyway.