This is an accurately crafted 3D model of the weapon itself. You would be paying for a minimized replica of the weapon in the show, no paper or cardboard, fully 3D printed.
MiserableSalmon@fb47b8c standing upright it stands at twenty centermeteres, you should be able to see see all dimentions just above the comments section :)
No don't worry you don't need a printer of your own! Shapeaway themselves will handle all printing and then ship it to you once ordered.
And in response to your earlier question you should have no problem applying spray paint to the model.
Please do feel free to ask any more questions and we will get back to you soon as possible.
All the best!