a dual extrution version is avalible here:https://www.thingiverse.com/thing:3508991
this is a model i garbed from grab-cad, its a great model but its riddled with holes, non-manifolds, intersecting faces and fliped normals i fixed them as best i could.
original file: https://grabcad.com/library/space-shuttle--1
(edit)i split the model up in separate pieces for easier printing
(edit 2) i fixed a few holes in the shuttles nozzles and made the nozzle walls a bit thicker for easier printing