This is a mount for the Tiptop Audio Zeus Studio Bus. The full STL model is provided, but a bit long for most 3d printers - I use the left/right pieces that can be printed separately.
Additionally, to finish the project, I used some threaded inserts that could be fit in the stand-off holes! You probably want to do the same.
This is an old project, so I've also included the openscad file I used to create it if you want to further customize it, but you might have to tweak it to generate the left/right sides independently.
The author marked this model as their own original creation.