Short interest during the two-week period ending September 29 rose on three of four 3D printing stocks we follow. As of that date, all four stocks had seen share prices down sharply from 2017 highs.

Short interest in 3D Systems Corp. (NYSE: DDD) rose by 1.1% to 27.19 million shares. Some 24.6% 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 2.2%. The stock’s 52-week range is $12.02 to $23.70, and shares closed at $12.68 on Tuesday, down about 3.6% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise by 0.4% in the final two weeks of September to about 5.83 million shares, or 11.7% of the company’s float. Days to cover rose from 15 to 16. The share price fell by about 2.6% in the period, and the stock closed at $22.59 on Tuesday, down about 3.4% on the day, in a 52-week range of $16.37 to $30.88.

Short interest in The ExOne Co. (NASDAQ: XONE) fell by 6.8% to 2.17 million shares. About 23.2% of the company’s shares were short. ExOne’s share price increased by about 13.7% in the two weeks. The stock’s 52-week range is $6.72 to $14.43, and shares closed at $10.19 on Tuesday, down about 4.7% for the day. Days to cover slipped from 13 to 12.

Short interest in Voxeljet A.G. (NYSE: VJET) increased by 6.7% to 534,246 American depositary shares, with days to cover falling from four to three. Voxeljet soared about 27.2% for the two-week period and closed at $5.21 on Tuesday, in a 52-week range of $2.61 to $6.37.

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