Alas investing in alternative means of Additive Manufacturing in metals, real diversification, is not possible. There is ExOne, a loser, and EOS which is private. I like to see companies with profits or at least a hint that they will be coming soon. And they have to be public to have shares that can be purchased.Which makes the available list small
In the early days of autos you could not buy stock in the big winner, Ford
I exclude companies involved in plastics like DDD because the present plastic technologies are very cheap.
And I exclude companies like HP, any look at history suggests few are able to catch up to innovation.
