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Re:SpaceX Launches Super-Heavy Communications Satellite by greglindahl on Tuesday May 16, 2017 @02:10AM (#14347700)
SpaceX announced that the plan for the currently aluminum-with-thermal-paint grid fins was to make them out of titanium.

https://www.nasaspaceflight.com/2017/03/spacex-new-spaceflig...

Re:SpaceX Launches Super-Heavy Communications Satellite by ChuckMcM on Tuesday May 16, 2017 @11:34AM (#14350368)
Thanks for that, I did not realize they had described the redesign publicly.