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Short interest during the two-week period ending April 13 rose on three of four 3D printing stocks we follow. As of that date, three of four stocks had posted a year-to-date gain.

Short interest in 3D Systems Corp. (NYSE: DDD) rose by 6.2% to 24.91 million shares. Some 22.9% of the company’s float was short. Days to cover rose from 13 to 16. In the two-week short interest period, the share price rose by about 5.1%. The stock’s 52-week range is $11.59 to $18.91, and shares closed at $15.59 on Tuesday, up about 1.2% on the day. Shares had gained 8.9% from January 3 through April 13.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise by 4% in the first two weeks of April to about 5.28 million shares, or 10.7% of the company’s float. Days to cover rose from nine to 12. The share price rose by more than 20% in the two-week period and the stock closed at $24.37 on Tuesday, up about 1.4% on the day, in a 52-week range of $16.37 to $27.67. Shares were up 27% through April 13.

Short interest in The ExOne Co. (NASDAQ: XONE) rose by 1.3% to 2.44 million shares. About 22.7% of the company’s shares were short. ExOne’s share price dipped by 0.5% in the two-week period. The stock’s 52-week range is $9.03 to $16.15, and shares closed at $10.09 on Tuesday, up 2.1% for the day. Days to cover rose from 13 to 18. The share price was up 1%.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 3.2% to 516,036 American depositary shares, with days to cover falling from 10 to seven. The share price rose by 9.5% in the two weeks to April 13. Voxeljet closed at $3.13 on Tuesday, down about 0.6% for the day, in a 52-week range of $2.61 to $6.25. The stock traded down about 1.7% through April 13.