Short interest fell during the two-week reporting period ending September 14 on two of four 3D printing stocks we follow. Trading action continued to slow as well, with days to cover rising on all four stocks.

Short interest in 3D Systems Corp. (NYSE: DDD) increased by 1.8% to 26.01 million shares. Some 23.6% of the company’s float was short. Days to cover rose from nine to 12. In the two-week short interest period, the share price fell by 9.2%. The stock’s 52-week trading range is $7.92 to $21.78, and shares closed at $19.61 on Tuesday, up about 2.2% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rose by 1.1% in the first two weeks of September to about 8.22 million shares, or 16.3% of the company’s float. Days to cover rose from 13 to 18. The share price fell by about 7.1% in the period, and the stock closed at $23.43 on Tuesday, up about 0.7% for the day. The 52-week range is $17.17 to $26.17.

Short interest in The ExOne Co. (NASDAQ: XONE) dipped by 0.5% to 2.31 million shares. About 23.8% of the company’s shares were short. ExOne’s share price rose by about 5.9% in the two-week period. Its 52-week range is $6.16 to $12.50, and shares closed at $9.80 on Tuesday, up about 3.8% for the day. Days to cover rose from 16 to 20.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 3.8% to 322,235 American depositary shares, with days to cover rising from three to 10. Voxeljet dropped about 7.1% for the two-week period and closed at $4.18 on Tuesday, up about 7.2% for the day in a 52-week range of $3.07 to $6.36.

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