This is a version of the Orion SpaceCraft compatible with Lego, that was done as a proof of concept for the NASA's Orion Program Office.
I recommend printing directly onto the plastic baseplate in order to avoid any warping. It takes a while to print all of the parts but snaps together easily when finished. a couple of extra lego parts are recommended in order to hold it all together.
Each set takes about 4 to 6hrs to print. A couple of extra round lego plates are recommended. I bought a couple of small kits that had the parts I wanted, or you can get some directly from the lego store online.