3-d printing is getting industrially significant. 

https://youtu.be/V7IsFQLjRNU
http://www.engineering.com/AdvancedManufacturing/ArticleID/14968/VIDEO-Atomic-Diffusion-Additive-Manufacturing-to-Print-Metal-Parts.aspx
Here are some investment ideas. It’s isn’t an easy area to play. 

http://investingnews.com/daily/tech-investing/3d-printing-investing/top-3d-printing-companies/