This is a phone mount for R50-R53 Mini Cooper.
It bolts in place of the normally broken cup holder. You didn't need that cupholder anyways, this is way better.
The holder has a boss with a hole that can be tapped or you can press a threaded insert in. In my case, I tapped it for a ¼"-20 threaded ball and attached the cheapest, crappiest phone holder on Amazon. Even the cheap holder holds my iPhone up under, uh, “spirited” driving conditions.
I printed with ASA using minimal painted supports on the boss. At 15% infill it cracked, so I reprinted with 50% adaptive cubic which is likely overkill but it's holding up just fine.
The author remixed this model.
I removed the ball from the original model and added a hole that can either be tapped or you can use a threaded insert.