X-37 originated as the Rockwell ‘ReFly’ program, picked up as an Air Force Research Lab research program as the Mini Spaceplane Technology (MiST) program, reorganized as the X-40, transferred to NASA as X-37 and then picked up with its current owner.

This model consists of 7 parts; the body, the 2 wings, the 2 rudders, the nozzle and a separate body flap. The original reason for the separate body flap was to make it articulate. I originally printed the body, with wings and rudders attached horizontally. Then I separated all the pieces to make the body printable standing on it end. A much smoother print than printing horizontal. This also lets you print the rudders and flap with black filament reducing the painting requirement.

The body flap has little nips on the side with corresponding dimples in the body. I found it easier to insert the body flay if I cut a little (very little) notch in one side of the body hole for flap. Then the body flap just snaps into the body, and moves up and down. (I noticed that the body flap will actually rotate up and touch the nozzle - Boeing has a software fix to limit this so I didn't worry about it ) ;-)

The logos on the side were found on the internet and printed as transfers from PowerPoint.

A cautious note: I had difficulty printing the rudders by themselves. Printing with the rudder flat on the build plate didn't work so printing with the flat portion that goes into the body on the plate and print vertically seem to provide best print. However, it would lose plate adhesion and fall over failing the print about 40% through. I found the best success printing the rudders with 100% infill, using glue stick, and adding mouse ears, or wide brim layers, and additional support. Nothing was perfect. If you get past 40% then you will probably be successful - good luck.