Short interest rose in all four of the 3D printing companies we follow, and it rose very steeply in one of the four. In the prior two-week period, share price hikes indicated a likely short squeeze, but that almost certainly did not happen in the first two weeks of July. Share prices fell at all but one of the 3D printer makers, and the uptick in short interest indicates that traders think the falling stock price trend will continue. The following information is based on data reported for the period ended July 15, 2014.

Short interest in 3D Systems Corp. (NYSE: DDD) rose 5.3% to 34.05 million shares. Some 32.6% of the company’s stock is short. Days to cover remained at seven. In the two-week short interest period, the share price fell about 35%, but it is down nearly 44% for the year to date as of Thursday night’s close. The stock’s 52-week range is $43.35 to $97.28, and shares closed at $53.16 Thursday.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise 3% in the first two weeks of July to 6.66 million shares, or about 15.7% of the company’s float. Days to cover dropped to four. Shares fell more than 7% in the two-week period, and they closed up about 0.7% Thursday night at $104.26. That is a drop of about 22% for the year to date. The stock’s 52-week range is $83.00 to $138.10.

Short interest in The ExOne Co. (NASDAQ: XONE) rose 7.5% to 3.81 million shares. About 46.2% of the company’s shares are now held short. Shares of ExOne fell nearly 5.5% in the two-week period and closed at $53.16 Thursday night, down about 47% year to date. The stock’s 52-week range is $24.34 to $78.80, and days to cover fell to five.

Voxeljet A.G. (NYSE: VJET) saw short interest rise a whopping 44.6% to 2.64 million shares, with a days-to-cover number of two. Since coming public at $19 in mid-October, the share price is down about 36%. Year to date, shares are down nearly 57%, but they rose about 1.5% in the two-week period to July 15. The stock closed at $18.45 Thursday, in a post-IPO range of $12.85 to $70.00.

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