E3D Chimera Cyclope To Prusa i3 Rework Mount
It is two variants: with label (Chimera), and without label.
The part tested in solidworks, and with real Chimera. Light and strong.
Listed on E3D wiki under Alternative Mounting Options:
http://wiki.e3d-online.com/wiki/Cyclops/Chimera_on_Prusa_i3- Check the new version: http://www.thingiverse.com/thing:1216890