Quote Originally Posted by 3dspider View Post
hmm... you can roto-cast plastic... I wonder if you could roto-cast metal (provided you had a high temp external mold... of course this would be extremely dangerous. Spinning liquid metal....
Yes you can roto cast metal : how do you think metal pipes are made ?
And yes... not simple. I think the heat dissipation control and the weight place this out of most tinkerer's range. I once saw a steel pipe roto mould : made of concrete, HEAVY.