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Short interest rose during the two-week period ending February 28 on two of four 3D printing stocks we follow. During the short interest reporting period, shares of one company fell just over 10%.

Short interest in 3D Systems Corp. (NYSE: DDD) fell by 4% to 37.08 million shares. Some 35.1% of the company’s float was short. Days to cover rose from 15 to 16. In the two-week short interest period, the share price fell by about 6.4%. The stock’s 52-week trading range is $7.92 to $23.70, and shares closed at $12.05 on Friday, up less than 0.1% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise by 2.9% in the final two weeks of February to about 8.37 million shares, or 17.3% of the company’s float. Days to cover fell from 12 to nine. The share price fell by about 10.4% in the period, and the stock closed at $22.49 on Friday, down about 0.6% on the day, in a 52-week range of $18.00 to $30.88.

Short interest in The ExOne Co. (NASDAQ: XONE) rose by 2.7% to 1.98 million shares. About 21.9% of the company’s shares were short. ExOne’s share price rose about 2.1% in the two weeks ending February 28. The stock’s 52-week range is $6.72 to $14.43, and shares closed at $9.27 on Friday, up about 0.9% for the day. Days to cover rose from 21 to 32.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 1.2% to 491,001 American depositary shares, with days to cover falling from 13 to four. Voxeljet dropped about 20.6% for the two-week period and closed at $3.83 on Friday, up about 0.8% for the day in a 52-week range of $2.61 to $6.37.