3D printers are a good idea. I was just going to send the CAD files off to a prototyping shop- they are much cheaper than making injection molds. Some of my ideas are to make the "mexican jumping bean" with some other key stem "legs" besides the blues.. Clears feel more tactile to me, minus the click, and I have a feeling it has to do with those feet. Could make things like a more tactile blue.
I saw that Cherry actually has some CAD files of a few of their switch parts, but not the MX...