3d printing with lunar dust

D-Shape, whose 3d printers are capable of fabricating amazing mega scale free-form building size models, are now working with the European Space Agency to create a 3d printer that can extrude within the moon’s vacuum environment using lunar dust.
They are currently experimenting with ‘simulant’ lunar dust, and hope to conduct trials in a vacuum environment in the near future.
If trials are successful such technology could help future lunar colonists and provide ‘thick-walled structures that protect against solar storms or micrometeorites’.
(via space.com)

[...] of fuss (even organics, which would make growing plants there much easier), and we already have some of the sort of oft-touted “emerging technologies” that will allow us to begin [...]
I am proud of mankind. How about the design of the final device? Have some concepts been published so far?
I am asking because I have the direct relation to the field.