I made this adaptor so that my wife could use her 710ml (24 oz) Yeti mug in her 2014 Chevrolet Trax. The mug is too wide for the stock cup holders and the handle also poses an issue. The adaptor sits in the cup holder to raise up a base the mug with handle can fit in without issue.
This will only work with the larger 710ml (24 oz) Yeti mugs and not the smaller sized one as they are a different diameter.
The cup holders it was designed for are ~83mm wide with rubber grips inside so the base of this model is 78mm.
I have included multiple files depending on your needs. The 1 pc file can be printed as a single print without supprt, however it will use substantially more filament than printing 2 pieces due to the bottom part being filled in. This option is more work if you wish to customize the size.
If you use the 2 individual pieces (top & bottom) you are able to significantly cut down on filament usage as the bottom is hollow. This option will require gluing the 2 pieces together after printing has completed. The top piece should not require any adjustments but the bottom piece can be adjusted based on the diameter and height of your car's cup holders.
Printing in PETG or ABS would be recommended due to the potentially hot environment of a sealed car in warmer months.