you can print it in all the scales you like. You just have to print the single slice 9 times to create the complete disc.
The file "UFO.stl" has 6 support blades you can easily remove after printing, you don't need automatic supports or else. If you have a DELTA 20 cm base diam. you could print the model 4 times bigger, obtaining the model you see in the pictures (55 cm diam).
After that, you can print the rest: the alien pilot is my own creation made with Sculptrix free modeling software.
The file "UFO cab" is upside down because it was like that in the CAD software, please turn it right!
You also have a small cone, that will be able to cover the little distances you could have matching the slices in the center of the rotor.