Slide in bracket to hold the iPhoneX that I use on my motorcycle. Requires a mounting device like the Wunderlich MultiPod or RAM mount, 2 screws and nuts. I am new to 3D printing so if you have improvement suggestions or comments let me know. I might also be willing to modify this design to different needs.

Print instructions

Slic3r 1.41.3. Settings

0.10mm Detail
PETG
40% Fill Density (seems to be plenty strong)
Supports YES everywhere
Brim YES (but probably could do without)

Support Changes to Defaults:
Overhand Threshold: 70% (Maybe adjust higher to improve cleanup?)
Contact Z: 2mm
Pattern: Honeycomb
Spacing: 3mm
Interface Layers: 1 (I read somewhere that this would be easier to remove than 2 layers, but it was still difficult to remove)
Interface patterns spacing: 0.3mm
Don’t support bridges: Turn This OFF! (i.e. NO checkmark. If you leave this on the back side will be a stringy mess)

The cleanup takes some time and a very sharp knife to remove supports that are inside the bracket. Takes about 9 hours to print.