Hi and thanks, I am using Inventor 2020 so a little different, I can put a small radius on inside corners, I assume that is what you mean. I chose every layer solid and for 4 boxes it added 25 inches of filament and 14 minutes to the 17 hour print time. All dimensions remain the same so that filament went somewhere!! I will do some testing and report. The previous boxes you could see many points of light when backlighting with a 9000 lumen flashlight. Yes, incredibly bright.
Thanks, Tom