Compared to the first six months of last year, ExOne's (NASDAQ:XONE) total sales have fallen 17% to $15.3 million. Along with these results, released earlier this month, management also reiterated that it expects ExOne to generate $58 million to $66 million in full-year sales.

Based on first-half sales, it implies that management believes ExOne will generate between $42.7 million and $50.7 million during the second half. This represents a 68% to 100% increase in revenue over the $25.4 million it generated during the second half of last year, and seems like a tall order to fill, considering the company has historically struggled to meet its own and Wall Street expectations.   

The following presentation digs into whether management is being realistic with ExOne's full-year guidance. 

Steve Heller owns shares of ExOne. The Motley Fool recommends ExOne. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.