This is a remix of 2 different designs put together and modified a little to make it work.

I suggest printing in ASA, if not ABS.

.4 Nozzle

6 Walls

4 Top Layers

4 Bottom Layers

35% Cubic Infill

Print on it's side with tree supports and they should come off very easily.

I've suggested printing with so many walls and in ASA because it needs to be super strong because the arm will break otherwise. Printing like this makes it solid.

I also find it prints the Audi logo a little better if you turn on Arachne (if your slicer supports it). But it should still come out excellent without it. Despite how it looks in the slicer, it prints pretty well.

You will need an iPhone lightning charger for the adapter (I superglue it in and it's won't move if you leave it to set for a couple of hours. Then screw the lightning adapter onto the main holder with 2x M2.5 / 8mm screws and washers.

Once clipped on plug the other end of the lightning adapter into USB slot under the arm-rest and each time you get in the car just slide your phone in and it charges and actives Apple Car Play.

The whole thing is solid and works really well (in my opinion lol).