Angle bracket for connecting 2x4

Fusion 360 file is attached, you can edit as you wish: change the screw holes, remove embossing.. 

Prints without support, orientation is correct in the stl file.

I managed to print this in ABS. It tends to bend, but increasing the chamber temperature and adding some circles made it quite printable. In PETG it prints without a problem. Still, make sure your bed is hot enough to prevent warping.

UPDATE. 

Added a slimmer version, added two more holes. Fusion 360 file included, feel free to edit.