SONY DSC-RX! Lens Hood
A modified version of:
http://www.thingiverse.com/thing:177304
Increased size to an inside diameter of 50mm at small end, and added opposing 2mm high bayonet lugs on the inside to friction fit to camera
This thing was made with Tinkercad. https://tinkercad.com/things/cmIPpHPTYry