Just created a duo of starships, with the smaller one nesting into the larger one, in such a way that if 3D printed, the smaller one wouldn't fall off the larger ship and fit snugly.

Click image for larger version. 

Name:	edf-separated.jpg 
Views:	393 
Size:	48.5 KB 
ID:	124327Click image for larger version. 

Name:	edf-combined.jpg 
Views:	383 
Size:	45.4 KB 
ID:	124328