We have tracked the key short interest changes as of September 13 in the following 3D printer and services companies: 3D Systems Inc. (NYSE: DDD), Stratasys Ltd. (NASDAQ: SSYS), The ExOne Co. (NASDAQ: XONE) and Proto Labs Inc. (NYSE: PRLB).

Short interest in 3D Systems rose 0.2% to 27.84 million shares. Some 29.1% of the company’s stock is short.

Short interest in Proto Labs declined by 3.4% to 2.89 million shares, or 14.2% of the total float.

Stratasys saw short interest drop by 5.7% in the first two weeks of September to 3.03 million shares, or about 10.8% of the company’s float.

Short interest in ExOne fell by 3.5% to 1.81 million shares. About 19.8% of the company’s shares are now held short.

A 3D printing company based in Germany, Voxeljet, has filed for an initial public offering, and this could have an impact on ExOne, already the most heavily shorted of these stocks. Voxeljet, like ExOne, does all its business with industrial and commercial customers. Neither company has a low-cost printer aimed at the consumer market.

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