Short interest during the two-week period ending April 29 fell on three of four 3D printing stocks we follow. Share prices for all four stocks declined during the period, ranging from a loss of around 3.2% to as much as 17%.

Three of the four companies we track reported first-quarter results after the end of the period, and the results were all lower than expected. Short selling may drop again in the current period.

Short interest in 3D Systems Corp. (NYSE: DDD) fell by 2.3% to 24.45 million shares. Some 23.3% of the company’s float was short. Days to cover rose from five to seven. In the short interest period to April 29, the share price fell by about 3.2%. The stock’s 52-week trading range is $6.00 to $23.98, and shares closed at $12.92 on Tuesday, up about 1.8% on the day. The share price dived 25% last week after a dismal earnings report.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise by 1.5% in the final two weeks of April to about 7.3 million shares, or 15.1% of the company’s float. Days to cover rose from five to seven. The share price tumbled by about 16.6% in the period and the stock closed at $21.69 on Tuesday, up about 4.3% on the day, in a 52-week range of $14.48 to $39.45. Stratasys reported better-than-expected results on Tuesday, and that gave the stock price a boost.

Short interest in ExOne Co. (NASDAQ: XONE) fell 5.8% to 1.74 million shares. About 19% of the company’s shares were short. ExOne’s share price fell by more than 9% in the two-week period. The stock’s 52-week range is $5.81 to $14.75, and shares closed at $10.48 on Tuesday, up about 3.8% for the day. Days to cover remained unchanged at six. ExOne also reported results on Tuesday that missed expectations.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 17.2% to 730,500 American depositary shares (ADSs), with days to cover rising from six to 11. The share price fell by 6% in the period to April 29. The ADSs closed at $5.57 most recently, up about 0.9% for the day, in a 52-week range of $3.50 to $8.35. Voxeljet is scheduled to report first-quarter results Thursday, and consensus estimates call for a net loss per share of $0.12 and revenues of $5.31 million.

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