After searching for quite a while to find a nice all in one basic iPhone 11 Pro holder mount for my Spark DJI controller I decided to make one from scratch. This is the current v2 mount which has some slight adjustments and two additional holes to allow for a neck strap to be added.
It has ample hand room under for comfortable use of the controls, and overall it is nice and sturdy. I was initially going to print in 2 parts that clip together but decided against the additional work. It would have made it more compact to store and allowed for the holder section to be printed with layers 90 degrees offset to how it currently prints, thus making it more rigid and less prone to cracking. Maybe in v3.
It holds the iPhone quite well, slide it in from the BOTTOM of the phone. as the buttons will restrict it being inserted.
I'm happy to modify the design for other sizes upon request (iPhone 6,7,8,X etc), a fiver would do it ;)
This will print as is with no need for support. I prefer 40% infill to ensure it's strong enough as the layers are technically the wrong direction for max strength in the phone holder section.
Measurements and a few trial and errors in Tinkercad.