Short interest in the two-week period ending December 31 fell for all four of the 3D printing stocks we follow. Share price declines for the full year in a range of 38% to 81% may lead even the most determined short seller to think twice about how much more these stocks can lose. The fact is, though, that share prices for all four closed lower on Monday than they did on December 31. The carnage may not be over yet.

Short interest in 3D Systems Corp. (NYSE: DDD) fell 8.3% to 34.29 million shares. Some 32.5% of the company’s stock was short. Days to cover slipped to 11. In the two-week short interest period, the share price rose nearly 10%, but it is down about 65% for 2014 and closed the year at $32.87. The stock’s 52-week range is $27.46 to $93.75, and shares closed at $31.36 on Monday.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest fall 5.7% in the last two weeks of December to 9.68 million shares, or about 22% of the company’s float. Days to cover fell to five. Shares pulled back about 3.7% in the two-week period and closed the year at $76.11, down about 38% in 2014. The stock closed at $75.65 on Monday, and the 52-week range is $73.77 to $131.09.

Short interest in ExOne Co. (NASDAQ: XONE) fell 6% to 3.62 million shares. About 38.5% of the company’s shares was short. Shares of ExOne dropped more than 6% in the two-week period and closed at $15.65 on Monday night. For 2014, the stock dropped about 73% and ended the year at $16.80. The stock’s 52-week range is $14.91 to $64.76, and days to cover fell to nine.

Voxeljet A.G. (NYSE: VJET) saw short interest drop 4.3% to 2.1 million shares, with days to cover falling to five. Shares fell about 81% in 2014 and closed the year at $8.12. The stock fell about 2% in the two-week period to December 31. The stock closed at $7.54 on Monday night, in a 52-week range of $7.13 to $43.44.

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