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Short interest during the two-week period ending September 15 rose on two 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) slipped by 0.2% to 26.89 million shares. Some 24.6% of the company’s float was short. Days to cover fell from 16 to 15. In the two-week short interest period, the share price rose by about 6.4%. The stock’s 52-week trading range is $12.02 to $23.70, and shares closed at $13.20 on Tuesday, up about 0.7% on the day. The share price had dropped by about 4.1% for the year to date on September 15, after reaching a peak of up nearly 75% in mid-May.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise by 2.1% in the first two weeks of September to about 5.81 million shares, or 11.7% of the company’s float. Days to cover rose from 12 to 15. The share price rose by about 6.6% in the two-week period, and the stock closed at $22.63 on Tuesday, up about 1% on the day, in a 52-week range of $16.37 to $30.88. Shares were up about 34% for the year to date on September 15, well shy of the 71% gain posted in mid-May.

Short interest in The ExOne Co. (NASDAQ: XONE) rose by 5.9% to 2.33 million shares. About 24.9% of the company’s shares were short. ExOne’s share price jumped by about 26.5% in the short interest period. The stock’s 52-week range is $6.72 to $16.15, and shares closed at $10.95 on Tuesday, up 6.5% for the day. Days to cover rose from 11 to 13. The share price traded flat for the year to date on September 15, after posting a gain of about 30% in mid-May.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 5.6% to 500,846 American depositary shares, with days to cover falling from 15 to four. The stock soared about 31.8% for the two-week period and closed at $5.45 on Tuesday, in a 52-week range of $2.61 to $6.37. Voxeljet was up about 68% for the year to date through September 15 and had added about 11.8% since January.