Simple sound box that directs the sound forward and gives a slight amplification. The beauty of it, is that it fits in your pocket.
I used Cura, support is 30% touching buildplate, 1mm clearance on X and 0.1mm on Z.
A brim of about 15 was also used. I tried without a brim and I lost bed adhesion.
The thickness of the shell is 2mm, so infill is not critical.
This was modelled in TurboCAD Deluxe 2015.