13" Dust collector Blower Fan Assembly

My Uncle made a large dust collector for his shop but he kept having problems with the fan assembly he made out of wood. He said he had balance issues and his fan assemblies would not last long. I figured I would take on the challenge of trying to make a fan assembly that would be well balanced and suite his purpose.
I first made the whole fan assembly in one .stl file. 13" was way too large for my print bed but I thought maybe I could use one of those online printing services. Nope, they want