This is a replacement rocket for the 1980's KAMCO Saturn Robot Robot.
This was created for the refurbish of a Saturn Robot. The rocket was printed out, molded with silicone, and cast in a urethane plastic. You can see the refurbishment here...
You could just print it out and paint it. I only molded and cast to to experiment with different types of plastic.
If you have problems printing it out, you can cut it in half, print out the halves and glue it together. That ended up working best for me.
If this model helps you out, please offer a tip.