Thank you for your replies.

Davo, Hyrel looks like a very interesting tool but can't perform the task we require (powder bed printing). When we need to update our FDM printer, I will write you as the possibilites with your mashine is intriguing.

awerby, I was afraid of an answer like that. We are having an inkjet printing set-up at our lab but don't have a lot of experience with it. Maybe, once we know more about what we can and cannot do with it, we might consider building our own printer based on this printhead. An airbrush just will not work, as the "dosing" of the binder is way to inaccurate for pharmaceutical applications.
I was just hoping that there is something robust out there :-/