I got tired of having my phone flop around in my cupholder while connected to carplay. This model is designed to fit in a cupholder for a 2017 chevy cruze premier but I will have a link that might allow you to edit it on onshape for your specific car. It is printing as I write this and will have a picture up when I test the model!

UPDATE 5/11/2018: Made the model taller and added storage with a lid coming soon!

https://cad.onshape.com/documents/4630205d43617761e190691f/w/d354eaceed0761897886257c/e/35520524efce5282b2523e85