I was originally going to print with supports until I saw this comment. Went with none and it went very smooth. I think I need to tweak settings to reduce stringing on the spires and wall thickness because some features get very thin but other then that it looks great.
The main bridge can be done with no supports and that is all that would get supports if you put them off the build plate. If you did them everywhere I don't know how you would get them out of the tunnel in the middle if you used a FDM printer.