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Short interest during the two-week period ending February 15 rose on two of four 3D printing stocks we follow. Year to date, share price gains have been strong for these stocks, ranging between 5.9% to 27.5%. Short sellers have gotten the message and are remaining on the sidelines for now.

Short interest in 3D Systems Corp. (NYSE: DDD) rose by 0.9% to 22.72 million shares. Some 21.3% of the company’s float was short. Days to cover rose from eight to 13. In the two-week short interest period, the share price rose by about 1.2%. The stock’s 52-week trading range is $10.74 to $19.76, and shares closed at $16.94 on Monday, up about 2.7% on the day. The company reports fourth-quarter earnings later this morning.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest drop by 4.2% in the first two weeks of February to about 4.61 million shares, or 9.4% of the company’s float. Days to cover fell from eight to seven. The share price rose by about 6.8% in the short interest period, and the stock closed at $20.94 on Monday, up about 2.5% on the day, in a 52-week range of $16.37 to $30.46.

Short interest in The ExOne Co. (NASDAQ: XONE) rose by 8.3% to 2.32 million shares. About 21.6% of the company’s shares were short. ExOne’s share price dropped about 1.2% in the two weeks. The stock’s 52-week range is $9.03 to $16.15, and shares closed at $10.66 on Monday, up 1.9% for the day. Days to cover rose from 16 to 22.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 0.9% to 521,163 American depositary shares, with days to cover rising from nine to 14. The share price fell 9.1% to February 15. The stock closed at $3.13 on Monday, up 3.3% for the day, in a 52-week range of $2.82 to $6.50.