This is a light and stylish design to hold smartphones and tablets. I made several and put them wherever needed in the house. The features include:

1. You could scale it up and down uniformly or along a particular axis to fit your actual need.
2. The current size should fit most of the smartphones and tablets.
3. It prints fast due to its small volume.
4. It's very light and handy to use.

I've used it for a while without any problem. Hope you'll like it too.

[Update 17th Feb 2021]
A new version was uploaded with the normals of the model surfaces all corrected to point outwards. The original file seems to have caused issues for certain (few) slicers (e.g. for MSLA printers). Thanks to the user Merec for pointing this out as I never noticed that.
I'm truly surprised to see 1700+ downloads as I just uploaded it one month and a half ago.

FLSUN QQ-S Pro

Doesn't Matter

No

0.2

10%

Depending on the precision and quality of your printer, you may need to trim the corners of the prints a bit, but I guess this issue is probably the same for most cases.