Short interest in three of the four 3D printing companies we follow rose sharply in the most recent two-week period. Stock prices for these companies have been rising and, given their volatile histories, betting that they will fall again is not a bad play. The following information is based on data reported for the period ended June 13, 2014.

Short interest in 3D Systems Corp. (NYSE: DDD) rose 8% to 33.97 million shares. Some 32.6% of the company’s stock is short. Days to cover is up to 10. In the two-week short interest period to June 13, the share price fell 4%, and it is down about 41% for the year to date as of Tuesday’s close. The stock’s 52-week range is $43.26 to $97.28, and shares closed at $55.45 last night.

Stratasys Ltd. (NASDAQ: SSYS) saw short interest rise 19.6% in the first two weeks of June to 6.99 million shares, or about 16.5% of the company’s float. Days to cover is now 8. Shares gained about 1.7% in the two-week period and have gained nearly 14% since June 13. Shares closed up about 0.6% Tuesday night at $107.92, a drop of nearly 20% for the year to date. The stock’s 52-week range is $79.83 to $138.10.

Short interest in ExOne Co. (NASDAQ: XONE) fell 5.7% to 3.18 million shares. About 30.4% of the company’s shares are now held short. Shares of ExOne rose less than 1% in the two-week period and closed at $35.60 Tuesday night, down about 43% year to date. The stock’s 52-week range is $24.34 to $78.80 and days to cover is 14.

Voxeljet A.G. (NYSE: VJET) saw short interest rise 10.3% to 1.74 million shares, with a days to cover number of 7. Since coming public at $19 in mid-October the share price is down about 36%. Year to date, shares are down nearly 58%, but rose about 1% in the two-week period to June 13. The stock closed at $18.40 last night in a post-IPO range of $12.85 to $70.00.

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