If you printed in aluminum, you'd be able to anodize in the color/pattern of your choosing. Going with a printed marker may well allow us to remove the need for locktite on the 'bonded components' which would mean that powder coating is also a maybe.
The limiting factor, of course, is going to be the internal air passages. The base may still have to be two parts that get bonded, as the passages may need to be cleaned after production. They may not, we'll just have to see what printing technology offers us.
Either way, I think we're still a little ways off from new markers. We need parts first