Short interest in the two-week period ending March 13 rose sharply for two of four of the 3D printing stocks we follow, while in one it declined and in another it was essentially flat. The highest increase in short interest accompanied an earnings miss, while the decline coincided with the appointment of a new company president.

Short interest in 3D Systems Corp. (NYSE: DDD) rose 5.8% to 38,601,557 shares. Some 36.6% of the company’s stock is short. Days to cover reached 19. In the two-week short interest period to March 13, the share price fell almost 10%. The stock’s 52-week range is $26.29 to $69.56, and shares closed at $28.19 on Tuesday. 3D Systems reported weak fourth-quarter and full-year 2014 results for the most recent periods.

Stratasys Ltd. (NASDAQ: SSYS) had a short interest increase of 11.9% in the first two weeks of March to 10,487,227 shares, or about 23.4% of the company’s float. Days to cover rose to 10. Shares fell about 8% in the two-week period. The stock closed at $59.87 on Tuesday the 52-week range is $51.55 to $130.83.

Short interest in The ExOne Co. (NASDAQ: XONE) pulled back 2.4% for the March 13 period to 3,570,434 shares. Around 40% of the company’s shares are now short. Shares of ExOne rose about 2% in the two-week period. The stock’s 52-week range is $13.19 to $48.66, and shares closed at $14.79 on Tuesday. Days to cover rose to more than 16.

Voxeljet A.G. (NYSE: VJET) posted short interest that rose 0.4% to 2,082,099, with days to cover rising slightly to 14. Shares fell more than 2% in the two-week period to March 13. The stock closed at $7.63 on Tuesday, in a 52-week range of $7.52 to $27.41.

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