Hope you enjoy and thanks for looking!
1. Download .STL file of the USS Enterprise 1701 Constitution Class
Step 1: CAD: Design and Modification
good Free 3D printing programs include: 123D Make from Autodesk and ReplicatorG
Step 2: Editing/Modification:
List of useful CAD programs:
2. Autodesk inventor fusion and professional (If you are a university student you can get their software for free)
3. NX 8
4. Google sketch up
Step 3: Color:
You should first make these changes within your CAD program as not to waste material.
Then add the modifications of color to your 3D printing program file