I did not create the original model. All credit goes to Chris Shakal (https://grabcad.com/chris.shakal).
Original model: https://grabcad.com/library/space-shuttle--1
Scale:1:96
What I´ve done is to make it 3d-printable and split every color in to different parts.
When printing the boosters, don´t forget to mark the parts so you know which one is which. One booster should use the mirrored mount.