Short interest in the two-week period ending February 13 rose for three of four of the 3D printing stocks we follow. With one exception, share prices for the 3D printing companies we follow rose by double digits in the two-week period. The exception dropped by double digits after several downgrades on the stock in early February following poor revenue guidance.

Short interest in 3D Systems Corp. (NYSE: DDD) rose 1% to 36.69 million shares. Some 34.8% of the company’s stock is short. Days to cover fell to 10. In the two-week short interest period to February 13, the share price rose nearly 13%. The stock’s 52-week range is $27.00 to $79.77, and shares closed at $30.02 on Wednesday. 3D Systems reported weak fourth-quarter and full-year 2014 results Thursday morning.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest decline 9.1% in the first two weeks of February to 9.62 million shares, or about 21.5% of the company’s float. Days to cover fell to three. Shares fell about 15.5% in the two-week period. The stock closed at $61.19 on Wednesday and the 52-week range is $51.55 to $131.09.

Short interest in The ExOne Co. (NASDAQ: XONE) rose 0.8% to 3.785 million shares. About 41.9% of the company’s shares are now short. Shares of ExOne rose about 18% in the two-week period. The stock’s 52-week range is $13.40 to $48.80, and shares closed at $14.79 on Wednesday. Days to cover fell to 11.

Voxeljet A.G. (NYSE: VJET) saw short interest fall 1% to 2.16 million shares, with days to cover rising slightly to seven. Shares rose more than 25% in the two-week period to February 13. The stock closed at $8.63 on Wednesday, in a 52-week range of $7.13 to $37.49.

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