On the Ultimaker forum Joel Mongeon posted his version of the gCreate rocket ship, printed with nGen. In his words:
A spaceship printed and painted for my toddler who loves “wockets”!
This is the gCreate rocket that can be downloaded here: http://www.gcreate.com/#!3d-model—gcreate-rocket/c1k6o
Printed with Colorfabb nGen. I cut off the tip of the rocket and used a hot tool to round it off. I then used a lot (maybe too much) XTC 3D to smooth the layer lines and add strength to the print. Finally used some shiny metallic paint and a layer of shellac to seal the deal.
3D printer: Ultimaker 2+
Nozzle diameter: 0.40 mm
Layer resolution: 81-100 micron
Print time: 24-48 hours
You can find the original post here: https://ultimaker.com/en/community/prints/4985-rocketship
More information about nGen here: http://ngen.colorfabb.com/