Well, you can't on an extruder which is what most people have, the tops would be flat since you can't have more than a 45deg over hang you would have to print them upside down. That is why I suspect you don't see it much at all. The peachy is a resin based printer so it can do much more aggressive over hangs and higher detail/smoother prints so... I honestly have no idea, it is brand new gear - we are getting a beta. I anticipate being able to do a number of keys at the same time, maybe an hour or two per run, who knows - if I can find a 3d model we will find out. (if it works, it opens interesting potential for all kinds of custom keys, and the peachy is slated to go to market for only $100 bucks so...)