This is the top half of the ESC bracket. It sits on top of the bottom half and is held in place with four self tapping screws. The control wires come of the top.
ping_sensor_cover from civrays on Sketchfab.
You can download the .stl or Freecad files here;
Don't have a 3D printer? If you are in the UK you cano order one from civrays via makexyz.
Please check out the other 3D parts;