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I've been putting off designing a phone holder for my roadster, for some time now. The previous mechanism of double-sided 3M sticking a pro clip mount to the dashboard was just working so well. But, then I upgraded to iPhone 6+, and that just wasn't gonna work any more.
So:
It is the usual two-part system. The base is what I 3D printed, black ABS, with a curved mount to match the dashboard curvature. Double sided 3M is nice and secure. The phone mount itself is pro clip, although I also 3D printed a phone mount as well to try - I'm not sure what I'll end up using, as I had the pro clip on order anyway and have had good success with them in the past.