I got tired of my smaller canned beverages sloshing around and causing spills. The cup holders are ~87.6mm (3.4inch) diameter, far too large to properly support smaller than standard cans. My MtnDew Kickstart, IZZE juice, or other 8.4oz (248ml) or 12oz (355ml) cans needed support, so I slapped this together. I'm sure it may work well for other years or other cars also. The ring outer diameter is 87.2mm and the inner can hole is 60mm (2.4inch) to support a decent variety of small cans. It slips into the cup holder and stops just above the illuminated ring if your vehicle is equipped with such.
A light, fast, easy print. I recommend a TPU filament for shock absorbing if that's your thing. Also easily stores in glove box or other organization area.
I made a quick one out of PLA and have been using it for two days, worked out great!
EDIT: My wife also says it makes a great cupcake holder.
EDIT: Decided to make a smaller addition for other things. Maybe you want to drop a flashlight in there and make sure it points straight up for some reason..idk. Or some other slimmer thing measuring under 30mm diameter.