How’s the weight of it when the phone isn’t docked? Perhaps you could add an insert for a steel plate on the bottom so it has a nice feel when the phone isn’t docked?
[1] https://www.youtube.com/watch?v=-gwXJsWHupg
[2] https://old.reddit.com/r/3Dprinting/comments/3hewrd/has_anyo...
[3] https://old.reddit.com/r/ResinCasting/comments/9v03mp/fillin...
It’s a nice way to stop these types of 3D prints from sliding around in surfaces, without having to resort to weights or lead shot, which it way more painful to integrate that you would expect.
https://sewelldirect.com/products/airstick-microsuction-tape