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Short interest during the two-week period ending July 14 rose on just one of four 3D printing stocks we follow. As of that date, the four stocks had posted year-to-date gains ranging from around 25% to more than 60%.

Short interest in 3D Systems Corp. (NYSE: DDD) rose by 2.4% to 24.88 million shares. Some 22.8% of the company’s float was short. Days to cover rose from nine to 11. In the two weeks to July 14, the share price fell by about 8.1%. The stock’s 52-week range is $11.98 to $23.70, and shares closed at $18.13 on Tuesday, up about 1.9% on the day. Shares have gained about 37% since the beginning of the year.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest fall by 2.3% in the first two weeks of July to about 4.24 million shares, or 8.5% of the company’s float. Days to cover rose from six to nine. The share price fell by about 0.3% in the period, and the stock closed at $25.11 on Tuesday, up about 3.1% on the day, in a 52-week range of $16.37 to $30.88. Shares are up nearly 52% year to date.

Short interest in ExOne Co. (NASDAQ: XONE) fell by 7.4% to 1.93 million shares. About 20.6% of the company’s shares were short. ExOne’s share price fell by about 3.8% in between the settlement dates. The stock’s 52-week range is $9.13 to $16.15, and shares closed at $11.50 on Tuesday, up about 1.7% for the day. Days to cover rose from 14 to 23. The share price is up more than 23% for the year to date.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 13% to 418,839 American depositary shares, with days to cover falling from eight to five. The share price fell by about 2.7% in the two-week period. The stock closed at $4.67 on Tuesday, up nearly 8% for the day, in a 52-week range of $2.61 to $6.00. It is up about 63% for the year to date.