Ten inches square is bigger than most (not all) consumer printers can handle, but eight inches would be doable by most. The design itself is pretty simple from a 3D point of view, I’d probably recommend printing as separate sides, then fixing them together to form a cube as this’ll give you the best finish on the lettering.
Hello, looks like stil no one offered you his service. I could try to do it for you, about 15 cm would be the maximum, but smaller = easier). I think I would ba able to design and print it next week, I could do each face separately, in different colours (yellow, black, phosphorescent green and phosphorescent blue).
You can contact me here if you are interested : dilwynlalaouna@orange.fr