The console cup holders on a second generation Honda Ridgeline (2017+) are quite generous in size for larger mugs and water bottles.  But unlike other Honda and Acura cup holders with either rubber flaps or fingers, there isn't anything to support standard 12oz beverage cans.  I made this simple ring insert to constrain cans.  

I made it with a groove for an O-ring thinking it would be required to hold the insert in place, but I found that it fits perfect without one.

It may also fit earlier models, but I don't know if the cup holders are the same.