This is the top part of the OpenPilot CopterControl case. You also need the bottom part and (optionally) the base.
More info here: http://wiki.openpilot.org/display/Doc/CopterControl+case
IMPORTANT NOTE: Due to some very slight dimensional differences, this case needs some minor modifications with a knife/file to fit the CC3D. A separate version is available for the CC3D.
4.03 w x
3.99 d x
1.587 w x
1.571 d x