This is a 8 color rocket model made to be printed using a Diamond hotend standard setup as described in : http://reprap.org/wiki/Diamond_Hotend
I've included the separate stl files and some amf file samples
I used Reprtier software+ Slic3r and a Modix 3d printer
This is how it should look when being printed:
(Yep , haven't inverted the x y yet :-)
Tip : don't print the model too small unless you make the "color wall" big enough to endure the color mixing.