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Short interest during the two-week period ending August 15 rose on three of four 3D printing stocks we follow. Share prices also rose on all four of the stocks during the period.

Short interest in 3D Systems Corp. (NYSE: DDD) rose by 3.2% to 27.22 million shares. Some 25.7% of the company’s float was short. Days to cover remained unchanged at eight. In the short interest period, the share price rose nearly 20%. The stock’s 52-week trading range is $6.00 to $19.76, and shares closed at $16.10 on Wednesday, up 1.9% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise by 0.7% in the first weeks of August to about 6.09 million shares, or 12.6% of the company’s float. Days to cover remained unchanged at five. The share price rose by more than 4% in the two-week period, and the stock closed at $23.17 on Wednesday, up about 2.8% on the day. The 52-week range is $14.48 to $32.52.

Short interest in The ExOne Co. (NASDAQ: XONE) rose by 3.6% to 1.82 million shares. About 19.4% of the company’s shares were short. The share price rose about 31% in the two weeks. The stock’s 52-week range is $6.50 to $14.75, and shares closed at $14.11 on Wednesday, up 1% for the day. Days to cover fell from 27 to nine.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 2.1% to 538,293 American depositary shares (ADSs), with days to cover falling from 93 to five. The share price rose by about 1.4% in the period to August 15. The ADSs closed at $4.24 on Wednesday, down about 0.9% for the day, in a 52-week range of $3.50 to $6.99.