The ExOne Company (NASDAQ: XONE) is hurting its peers and rivals in the 3D printing sector. Investors have become used to warnings from this group, and now it seems as though the hype may still be larger than the growth – even if great growth rates still are likely ahead.

The ExOne Company just became the ex-guidance company. Along with its earnings – only $10.7 million in revenue and a loss at -$0.22 in earnings (losses) per share, ExOne guided 2014 revenues down to a range of $55 million to $60 million. Thomson Reuters was calling for revenues of just over $61.5 million – and ExOne’s market cap was almost $630 million at the close for a multiple of 10-times expected revenues.

ExOne shares had gotten ahead of reality, because the stock had risen to $43 from under $40 in recent days. Shares dropped almost 10% to $39.15 in the after-hours session on Thursday.

The move is hurting 3D printing companies. 24/7 Wall St. would just point out that the warnings had already started.

3D Systems Corp. (NYSE: DDD) was down another 1.3% at $61.82 in the after-hours, after closing lower by 0.5% on Wednesday. We had just seen a large amount of CEO and insider selling, and now we have another peer warning. Just keep in mind that ExOne is one-tenth the size of 3D Systems in market cap.

Stratasys Ltd. (NASDAQ: SSYS) was down almost 1% on Wednesday, and the stock fell in sympathy by another 1.5% to $114.50 in the after-hours after the ExOne news. While its market cap is lower than 3D Systems’ at $5.7 billion, Stratasys has held up the best versus 3D printing companies with a pullback of “only” 16% from its recent highs.

Thursday should be exciting in 3D printing.

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