This is a remix from a wall mount on Thingiverse by spiceyux. I wanted to separate the parts into three pieces for shorted print times. I also changed the dimensions a little and added a lip for the bottom. After printing I used super glue to hold the pieces together but I don't believe that it is necessary.
https://www.thingiverse.com/thing:4801960
The author hasn't provided the model origin yet.