[surfwizz]

In 2008, one of our mentors got some small pieces of scrap titanium honeycomb from his job. We originally used it for ultralight forklift prongs for the trackball, but when that design didn't work, we ended up using another piece as a shooter disk attached to a pneumatic cylinder. The titanium was quite possibly the scariest thing we ever machined, and the mentor who was supervising the fabrication told us that it could easily catch fire and that if it did, we would not be able to put it out. As I recall, his advice if that happened was to, "throw it on the concrete floor and run away". The titanium really wasn't worth the trouble and we got no real advantage from using it, other than that it sounded cool. I can't speak for other honeycomb materials, but they definitely might be worth looking into.