Cell Phone Tripod/Teleprompter Mount

I needed a mount for my cell phone for the teleprompter that was made by https://www.thingiverse.com/dsft
which is linked here https://www.thingiverse.com/thing:2978080

I found a few but they all required that I have a rubberband wrapped around the screen of my phone. This one works well with a rubber band or elastic hair tie and goes into the grooves on each piece and not over the phone screen.

This does require a small amount of support material for the slide part of the holder and I h