You can make this on a milling machine both cnc and manual its a lot easier then you think it is, the question is how many people have figured out the secret to doing it?
Depending on what material you are using you could even do it on a lathe with a 4 jaw chuck, it wouldn't be easy but it can be done.
My students make the dice out of 1.5" inch aluminum cubes and they retain most of that original size. It is the same process for doing it out of round parts