Short interest during the two-week period ending December 31 declined in three of four 3D printing stocks we follow. Share prices rose on two of the stocks during the two weeks, although one posted a new 52-week low on Tuesday.

As a group, short interest in these stocks is waning. Since July the trend has definitely tracked lower, and days to cover have trended into the double digits. It appears that there simply is not enough action in the 3D printing stocks to interest short sellers. That could change in a heartbeat though.

Short interest in 3D Systems Corp. (NYSE: DDD) rose by 1.5% to 33.73 million shares. Some 31.9% of the company’s float was short. Days to cover fell from 13 to nine. In the two-week short interest period to year’s end, the share price fell about 3.3%. The stock’s 52-week range is $7.54 to $33.17, and shares closed at $7.78 on Tuesday, up nearly 3% on the day after posting the new low.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest fall by 2.8% in the last two weeks of December to about 11.29 million shares, or about 23.3% of the company’s float. Days to cover slipped from 13 to 12. The share price retreated about 0.2% in the two-week period, and the stock closed at $20.57 on Tuesday, down about 2% on the day after posting a new low of $20.03. The 52-week high is $82.79.

Short interest in ExOne Co. (NASDAQ: XONE) slipped 2.3% to 2.24 million shares. About 24.7% of the company’s shares were short. ExOne’s share price rose 9% in the two-week period. The stock’s 52-week range is $5.81 to $17.79, and shares closed at $8.05 on Tuesday, up more than 7% for the day. Days to cover fell from 11 to six. The share price spike on Tuesday followed an announcement by the company’s CEO that he will invest $13 million in a direct share offering at a price of $9.13 per share.

Short interest in Voxeljet A.G. (NYSE: VJET) decreased by 11.1% to 1.08 million American depositary shares, with days to cover dropping from 12 to nine. The stock price rose by 3.7% in the most recent short interest period. The stock closed at $4.25 on Tuesday, down about 1.2% for the day, in a 52-week range of $4.11 to $10.75.

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