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Short interest during the two-week period ending July 31 was mixed on the four 3D printing stocks we follow. Share prices plunged for three of the four stocks, in a range of 8% to 22%, and short sellers showed interest in just one company.

The 3D printing stocks are no longer very actively traded. Days to cover fell on all the stocks but one, and the exception posted a big jump in trading (and a drop in price) when it reported earnings on July 30. Short sellers are treading cautiously with these stocks.

Short interest in 3D Systems Corp. (NYSE: DDD) dropped 4.5% to 34.72 million shares. Some 32.8% of the company’s float is short. Days to cover fell from 13 to 11. In the two-week short interest period, the share price fell more than 22%. The stock’s 52-week range is $11.66 to $54.24, and shares closed at $14.03 on Tuesday, unchanged on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise by 2% in the final two weeks of July to about 13.14 million shares, or about 27.7% of the company’s float. Days to cover fell from 12 to six. The share price fell nearly 9% in the two-week period. The stock closed at $31.34 on Tuesday, down nearly 4% on the day, and the 52-week range is $27.66 to $130.83.

Short interest in ExOne Co. (NASDAQ: XONE) dropped 4.8% to 2.88 million shares. About 31.6% of the company’s shares are now short. ExOne’s share price fell more than 8% in the two-week period. Days to cover slipped from 20 to 18. The stock’s 52-week range is $7.73 to $31.855 and shares closed at $7.81 on Tuesday, down about 13% for the day, after posting the 52-week low.

Voxeljet A.G.’s (NYSE: VJET) short interest declined by 4.7% to 1.42 million shares, with days to cover rising from 10 to 13. The stock price rose about 5% in the two weeks to July 31. The stock closed at $7.17 on Tuesday, down about 1.1% for the day, in a 52-week range of $5.52 to $18.45.

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