Echoes - Sound improvement case for Xiaomi Redmi 4a

Hello!
This is echoes, an improved sound case for the Redmi 4a.
It is based of an parametric universal case that I have the files but I don't find right now here on thingiverse, I will update this with the origin if I find it.

I modified the resulting STL from openscad with a sound guide made by a thin layer using tinkercad.

This case allows you to put your phone on a table or a plain surface and still have a good audio, also redirects the back sound to left and right, is not stereo but