My Kenu Airframe was bought and used since my iPhone4.
With bigger Smartphones, especially within a battery case, the proper hold was´t given anymore.
So I made Extensions to hold my bigger phone.
I thought, printed in TPU would work, but the phone slipped.
So I went on and printed them in PLA and glued some cellular rubber (1mm thick) on.
Now my Kenu Airframe holds my phone nicely.
i also had issues with the Frame turning a little bit - so I added an adapter with a 10° angle to fix that problem

Creality

Ender 3

No

No

0.2 mm

15%

Supports only for the adapter to prevent turning.
The extensions print nicely "upside down", may be with a brim, depending on your adhesion

Made with Fusion 360, took measurements and went on from there