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ExOne specialized in additive manufacturing with metals, using a binder-jet process.   A good overview of the original high-risk thesis can be found here, but note that I warned readers that the short squeeze was looking unsustainable just 2 months later.  This gave investors a chance to get out with 10% gain.  By the time coverage began here on CrowdWisers, notes were becoming increasingly bearish as the company pursued a strategy that had little chance of bearing fruit until at least 2016 or 2017.  Using the rank filters to the lower right should make the trend very evident.

Although I did manage to call the bottom on XONE, it was with great caution, and I instead turned to shorting some of the highs later on to good effect.  Even so, I kept my commitment to subscribers until they agreed in late 2017 that it was time to drop coverage in order to devote more attention to the many better ideas that I have identified.  I continue to be interested in the science that drives this industry, and readers may wish to give particular attention to the final three updates, the last of which merely documents that ExOne was eventually acquired by the very competitor that I cited as potentially dominant.