I wanted a simple phone mount to use my old Nexus 5 as a display on my P1P.
It's a quick print with no supports needed, and it snaps in the oval hole on top of the printer's faceplate.
You can either use M3x4.0x5.0 brass inserts in the base, or screw directly into the noinsert version.
The mount included is designed to fit a LG Nexus 5, I'm including the STEP files so you can remix and adapt it to your needs.