I used M6x10 screws due to my printer not being calibrated very well when trying to make the two pegs for the two pieces to connect.
If your printer is able to make good circles then you shouldn't have any issues with the holes and the two pegs.
Printed in ABS due to hot temps in the car otherwise it will warp, I added side bolters so the phone won't slide off which the original might not have accounted for.
For fitment-wise, this fits my iPhone14 with a case perfectly (YMMV) as well as it fits in my 03 wrx cassette.