Just a tinkercad project I made as I wanted an angled base for my midi controller.  Print without support in PLA.  10% infill, any layer height (printed mine at draft .28 for speed) No adhesion issues due to small bottom surface area.

I tried to make it use as little filament but still be strong.  Didn't see the need for a full bottom or top as the other design available has. 

Dimensions in screenshot