I just needed a bigger cup holder for my Miata, the one by Mirko looked pretty good but it didn't fit my water bottle so I enlarged it a bit.
It is now about a 76mm inner diameter.
The onshape file is attached: https://cad.onshape.com/documents/1e161e145a9c9aa26e5a30fd/w/008d96f23106dd3c08b07676/e/f2e984b6bb07912983bb347e?renderMode=0&uiState=64f114fd5ad47a657eb47cb9
I printed it out of Hatchbox PETG
The author remixed this model.