Simple phone holder for car vent

I really liked the original model due do its simplicity, but needed something that didn't require a charging cable. Changes I made are as follows:

• Charging cable mount removed. The bottom of the holder has plenty of room for any type of cable, and I added a lip to hold the phone in place without one.
• Hollowed out a big section of the holder that was previously solid. This saved material and print time, and the functionality is the same.
• Improved the mount for the vent clips so they don't fall out. They are now slightly compliant: simply insert them into the top slit and rotate to fasten.

The modifications I made are not perfect, but hopefully most size adjustments should still work in the Fusion 360 files.

Avoid printing with PLA if possible since it might deform in a hot car.