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Stocks of 3-D printers are getting killed today.
ExOne is off nearly -13% after BB&T downgraded them to "hold" over skepticism about the company's prospects of selling itself.
Meanwhile, 3D Systems Corp. is down more than -3%, and Stratasys Inc. is down more than -5.5%.
The sector have been on a tear for most of the year, but somecommentators have argued it's now entered a temporary bubble.
ExOne now sees 34.4% of its float in short positions, while and 3D Systems' has hit 28.7%.
SEE ALSO: Tesla getting crushed
