The file 'Universal Articulating Phone Mount / Holder – For Articulating Arm 3D Printer Model' is (stl,step) file type, size is 13.1MB.
View the mount in action and and see how to assemble this "thing" on my youtube channel https://youtu.be/3crWZbaTAGU
This mount can rotate 360 degrees and pitch up/down +/- 90 degrees; it can be mounted on the stock arm facing either way with locking indents on both sides (see the video, it'll make more sense).
The only non-printed part you will need is a rubber band. The nice fat ones that tend to come on produce (like celery) are perfect.
No disassembly required to insert/remove the phone or to adjust the phone rotation or pitch.
Might not fit extremely narrow phones - minimum width of the grip is 72mm
Update 4/2/2018
Added another degree of motion with the Elbow parts! Finally tilt and twist!
Elbow_-_All_Parts.stl | 4.2MB | |
Gripper_Phone_Mount_v17_All_parts_in_single_print.stl | 14.1MB | |
Gripper_Phone_Mount_v17_Clamp_Nut_Gripper.stl | 1.6MB | |
Gripper_Phone_Mount_v17_Clamp_Screw_Gripper.stl | 2.1MB | |
Gripper_Phone_Mount_v17_Clamp_Washer_Gripper.stl | 677.7KB | |
Gripper_Phone_Mount_v17_Top_Arm_Gripper.stl | 447.3KB | |
Gripper_Phone_Mount_v17_Top_Band_Lane_Gripper.stl | 920.9KB | |
Gripper_Phone_Mount_v17_Wrist_Gear_Gripper.stl | 2.8MB | |
Gripper_Phone_Mount_v17_Wrist_Lock_Gripper.stl | 645.5KB | |
Gripper_Phone_Mount_v17_Wrist_Socket_Gripper.stl | 2.7MB | |
Universal_Phone_Mount_Assembly_v17.step | 5.8MB |