Adjustable Smartphone Stand (light version)

Update:
I made remix of this to increase the rigidity, and I made a movie for assembly.
https://www.thingiverse.com/thing:3154951


Old Description2:
All files were modified to make it more stable and reduce printing time. This can also use for tablet.

A thin metal wire or thread is necessary to pull out the rubber band.

Old Description:
I was inspired by https://www.thingiverse.com/thing:1755530.
To hide the rubber band, I made this adjustable smartphone stand.
I used 100mm Insul