Two weeks ago I wrote an article focused on The ExOne Company ( XONE ) and in it I mentioned the importance of the expansion of their Production Service Centers (PSCs) for future growth: "In 2012, ExOne's PSC network accounted for 45% of total revenues utilizing just 5 PSC centers. The company plans to expand to 15 PSCs by 2015, and that rapid expansion is why many investors (including this writer) are bullish on the company."