Our warning to avoid “3D printing” stocks is still proving to be a heck of an idea…

In January 2014, we ran a warning on the market’s top 3D-printing stock, 3D Systems (DDD). 3D printing is the printing of solid objects… rather than conventional “on paper” printing.

The industry uses computers and special materials to “print” things like tools, guns, and toys.

Over the past few years, 3D printing has become one of the world’s biggest tech stories. And with good stories come good stock rallies.

Printer maker 3D Systems shot from $10 a share in late 2011 to $97 in early 2014. It’s one of the biggest stock market winners in recent memory.

In our original note, we mentioned that high-growth “story” stocks like 3D Systems often get far too popular with the investment public… and far too expensive. When growth rates slow, these stocks get slammed.