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Short interest during the two-week period ending July 15th was mixed on the four 3D printing stocks we follow. Share prices plunged in a range of 8% to 16% for all four stocks, and short sellers piled into one company.

The 3D printing stocks are not being very actively traded any longer. Days to cover on all the stocks is now in the double digits, and for one company is equal to 4 weeks of trading. From the highs of 18 months ago to the current lows and near-lows has been a swift and nearly unbroken slide.

Short interest in 3D Systems Corp. (NYSE: DDD) slipped 0.4% to 36.36 million shares. Some 34.3% of the company’s float is short. Days to cover fell from 15 to 13. In the two-week short interest period to July 15th, the share price fell more than 15%. The stock’s 52-week range is $14.30 to $56.45, and shares closed at $14.77 on Friday, up about 0.3% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise by 12% in the first two weeks of July to around 12.88 million shares, or about 28.7% of the company’s float. Days to cover rose from 7 to 12. The share price fell nearly 8% in the two-week period. The stock closed at $34.47 on Friday, up about 2.5% on the day, and the 52-week range is $30.95 to $130.83.

Short interest in The ExOne Co. (NASDAQ: XONE) rose 0.2% to 3.02 million shares. About 33.2% of the company’s shares are now short. ExOne’s share price fell nearly 16% in the two-week period. The stock’s 52-week range is $9.08 to $37.15 and shares closed at $9.19 on Friday, down about 3.4% for the day after posting the 52-week low. Days to cover rose from 18 to 20.

Short interest in Voxeljet AG (NYSE: VJET) declined by 1.6% to 1.49 million shares, with days to cover declining from 18 to 10. The share price fell more than 14% in the two week period to July 15th. The stock closed at $6.64 on Friday night, down about 2.2% for the day, in a 52-week range of $5.58 to $19.95.

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