Xperia Z3 tripod mount
Took the Xperia holder from Sony Xperia Z3 Mount For Playstation Dualshock 4 and added the screw from [Galaxy S4 Tripod Mount].(http://www.thingiverse.com/thing:137118)
So now You have a nice tripod mount for your Xperia Z3.
EDIT: Fixed remaining internal faces.