One of my first attempts at creating/modifying something and not just printing downloaded stuff. I could have made it from scratch, but as the rain gauge by nimbledesign https://www.thingiverse.com/thing:729537 will be on the same post I wanted to have the same basic design.

Creality

Ender 3

No

No

0,2mm

20%

I have used tincercad to very crudely hack this mount together. I haven't mounted it yet, but it is designed to be used with a 1/4" Camera screw.
I have mirrored the wall-mount side, filled up one hole, widened the other for the 1/4" screw and cut some excess material out of it.

I'm very new to this so please forgive any obvious errors. I've never worked with 3d modelling tools, so I use a bit of trial&error (with a sledgehammer)...