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Short interest during the two-week period ending August 31 fell on three of four 3D printing stocks we follow. When General Electric Co. (NYSE: GE) announced its acquisition of two 3D printing firms last week, shares of these stocks bounced. Although they have since given back some of that bounce, all trade higher than they did before the GE announcement.

Short interest in 3D Systems Corp. (NYSE: DDD) fell by 2.4% to 26.56 million shares. Some 25% of the company’s float was short. Days to cover rose from eight to 10. In the two-week short interest period, the share price fell by about 5.8%. The stock’s 52-week trading range is $6.00 to $19.76, and shares closed at $15.49 on Monday, up about 2.2% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest fall by 2.6% in the last two weeks of August to about 5.93 million shares, or 12.2% of the company’s float. Days to cover rose from five to seven. The share price rose by 1.7% in the two-week period, and the stock closed at $21.52 on Monday. That was down 0.8% on the day, in a 52-week range of $14.48 to $32.52.

Short interest in The ExOne Co. (NASDAQ: XONE) fell by 5.7% to 1.71 million shares. About 18.2% of the company’s shares were short. ExOne’s share price was flat in the two-week period. The stock’s 52-week range is $6.50 to $14.75, and shares closed at $13.73 on Monday, up 2% for the day. Days to cover rose from nine to 15.

Short interest in Voxeljet A.G. (NYSE: VJET) increased by 4.1% to 560,464 American depositary shares (ADSs), with days to cover rising from five to nine. The share price fell by more than 7% in the two weeks to August 31. The ADSs closed at $4.34 on Monday, down about 3.1% for the day, in a 52-week range of $3.50 to $6.99.