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Short interest rose yet again in the two-week period ending July 31 for all four of the 3D printing companies we follow. Share prices fell at all four companies during the period and all have taken sharp drops year-to-date. Short sellers appear to believe that this state of affairs will go on for some time.

Short interest in 3D Systems Corp. (NYSE: DDD) rose 5.9% to 36.07 million shares. Some 34.6% of the company’s float is short. Days to cover rose to nine. In the two-week short interest period to July 31, the share price fell about 12% and is down nearly 48% year-to-date as of Monday night’s close of $49.16. The stock’s 52-week range is $43.35 to $97.28.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise 3.1% in the last two weeks of July to 6.86 million shares, or about 15.8% of the company’s float. Days to cover rose to 11. Shares fell more than 3% in the two-week period. Shares closed up about 0.6% Monday night at $115.11, but have dropped about 14% so far this year. The stock’s 52-week range is $85.30 to $138.10.

Short interest in ExOne Co. (NASDAQ: XONE) rose 5.6% to 4.02 million shares. About 48.8% of the company’s shares are now held short. Shares of ExOne fell nearly 8% in the two-week period and closed at $31.32 Monday night, down nearly 50% year-to-date. The stock’s 52-week range is $24.34 to $78.80, and days to cover fell to five.

Voxeljet AG (NYSE: VJET) saw short interest rise 9.4% to 2.88 million shares. Days to cover is 6. Since going public at $19 in mid-October, the share price fell about 44%. Year-to-date, shares tumbled nearly 63%, and in the two week period to July 31 shares fell about 9.5%. The stock closed at $16.13 Monday night in a post-IPO range of $12.85 to $70.00.

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