1/100 model of the Boeing CST-100 Starliner Commerical crew vehicle atop its Atlas V 421 launcher. The starliner is one of two commercial crew vehicles designed to take astronauts to space from US soil.
The Starliner model used here is the one found at https://www.thingiverse.com/thing:970338 printed at 54.25% scale.
The RD-180 engines have 1/4in free fit holes to allow for easy mounting.
This model was made with ABS on a Zortrax M200. Using other printers/materials may affect the tolerances.