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Short interest during the two-week period ending June 15 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 40% to around 80%.

Short interest in 3D Systems Corp. (NYSE: DDD) rose by 1.5% to 23.56 million shares. Some 21.6% of the company’s float was short. Days to cover was 11. In the two-week short interest period, the share price rose by about 1.2%. The stock’s 52-week range is $11.59 to $23.70, and shares closed at $21.28 on Monday, down about 3% on the day. Shares have gained about 60% since the beginning of the year.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest fall by 11.4% in the first two weeks of June to about 4.68 million shares, or 9.5% of the company’s float. Days to cover rose from three to eight. The share price fell by 2.4% in the period, and the stock closed at $24.39 on Monday, down about 11.4% on the day, in a 52-week range of $16.37 to $30.88. Shares are up nearly 48% year to date, but a downgrade from Goldman Sachs clobbered the stock yesterday.

Short interest in The ExOne Co. (NASDAQ: XONE) fell by 5.1% to 2.16 million shares. About 20% of the company’s shares was short. ExOne’s share price fell by about 2.5% in the period. The stock’s 52-week range is $9.08 to $16.15, and shares closed at $13.01 on Monday, down about 1.9% for the day. Days to cover rose from 10 to 17. The share price is up more than 39% for the year to date.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 28% to 537,942 American depositary shares, with days to cover at four. The share price rose by 1.9% in the two weeks to June 15. It was at $5.17 on Monday’s close, down 1.3% for the day, in a 52-week range of $2.61 to $6.00. Voxeljet is up about 80% for the year to date.