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Short interest during the two-week period ending July 29 dropped on three of the four 3D printing stocks we follow. Share prices declined on all four the stocks during the short interest period.

Short interest in 3D Systems Corp. (NYSE: DDD) fell by 5.7% to 26.38 million shares. Some 24.9% of the company’s float was short. Days to cover remained about nine. In the two-week short interest period, the share price rose by 9.0%. The stock’s 52-week trading range is $6.00 to $19.76, and shares closed at $15.36 on Tuesday, flat for the day.

In the final two weeks of July, Stratasys Ltd. (NASDAQ: SSYS) saw short interest fall by 16.0% to about 6.04 million shares, or 12.5% of the company’s float. Days to cover dropped from eight to five. The share price retreated by about 10.1% in the period. The stock closed at $20.74 on Tuesday, up about 2.6% on the day, in a 52-week range of $14.48 to $33.13.

Short interest in The ExOne Co. (NASDAQ: XONE) rose by 0.3% to 1.75 million shares. About 19% of the company’s shares were short. ExOne’s share price retreated about 5.0% in the two-week period. The stock’s 52-week range is $5.81 to $14.75, and shares closed at $11.57 on Tuesday, up more than 3% for the day. Days to cover rose from 19 to 27.

Voxeljet A.G.’s (NYSE: VJET) short interest increased by 0.3% to 549,631 American depositary shares (ADSs), with days to cover rising from 13 to 16. The share price fell by about 3.8% in the two-week period to July 29. The ADSs closed at $4.73 on Tuesday, up about 0.4% for the day, in a 52-week range of $3.50 to $7.50.