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Short interest was in retreat during the two-week reporting period ending December 14 on all four 3D printing stocks we follow, even as their share prices were declining sharply in one of the most brutal Decembers for stock investors on record.

Short interest in 3D Systems Corp. (NYSE: DDD) decreased by 0.6% to 22.64 million shares in the two-week reporting period. Some 20.5% of the company’s float was short. Days to cover ticked down from 18 to 17. In the short interest period, the share price dropped by 15.8%. The stock’s 52-week trading range is $8.53 to $21.78, and shares closed at $10.07 on Wednesday, up about 3.3% on the day.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest dip by 2.3% in the first two weeks of December to about 6.27 million shares, or 12.5% of the company’s float. Days to cover remained about 18. The share price retreated 10.3% in the period, and the stock closed at $18.40 on Wednesday, up about 5.7% for the day, in a 52-week range of $17.06 to $26.17.

Short interest in The ExOne Co. (NASDAQ: XONE) dropped by 1.7% to 2.47 million shares. About 25.5% of the company’s shares were short, and ExOne’s share price pulled back by about 19.1% in the two weeks ending December 14. The stock’s 52-week range is $5.98 to $12.50, and shares closed at $6.42 on Wednesday, up about 5.9% for the day. Days to cover shrank from 22 to 17.

Short interest in Voxeljet A.G. (NYSE: VJET) declined 9.4% to more than 371,000 American depositary shares, with days to cover sinking to six from 10. Voxeljet dropped about 18.9% for the two-week period. It closed most recently at $1.64, down about 1.5% for the day, in a 52-week range of $1.55 to $5.63.

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