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Short interest fell during the two-week reporting period ending July 31 on three of four 3D printing stocks we follow. Trading action also slowed down on two of the four stocks

Short interest in 3D Systems Corp. (NYSE: DDD) dipped by 0.9% to 31.76 million shares. Some 28.9% of the company’s float was short. Days to cover fell from 21 to 14. In the two-week short interest period, the share price tumbled by 20.2%. The stock’s 52-week trading range is $7.92 to $18.70, and shares closed at $18.16 on Thursday, up about 1.1% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest fall by 3.5% in the final two weeks of July to about 9.58 million shares, or 19.1% of the company’s float. Days to cover rose from 18 to 20. The share price fell by 4.9% in the short interest period, and the stock closed at $23.31 on Thursday, up about 0.6% on the day,. The 52-week range is $17.17 to $25.00.

Short interest in The ExOne Co. (NASDAQ: XONE) rose by 3.7% to 2.51 million shares. About 25.8% of the company’s shares were short. ExOne’s share price fell by about 7.4% in the two weeks ending July 31. The stock’s 52-week range is $6.16 to $12.50, and shares closed at $8.01 on Thursday, up about 0.1% for the day. Days to cover rose from 22 to 26.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 9% to 358,325 American depositary shares, with days to cover falling from 23 to 17. The stock fell by about 7.3% for the two-week period and closed at $3.46 on Thursday, up about 4.9% for the day in a 52-week range of $3.07 to $6.37.