Remix of https://www.thingiverse.com/th... so that the phone ends up between the vents on cars that have a space between the vents (like the VW Bug 2005).

I used PETG with 100% infill on everything except the sled which I used 25% infill for.

Updated Sep. 12th 2019: I changed the design so that instead of the rubber bands holding the arms open they now keep a grip on the phone.  I was worried that with the original design that the phone may go flying across the car if I hit a big enough bump in the road.  You can add a pretty tight rubber band to the back over the top of the sled and the bottom of the back plate.