Press Releases 3D Systems Solid Imaging
3D Systems Announces Successful Appeal
Patent Infringement and Unfair Competition Lawsuit

Contact:
Mary Woods, Public Relations Mgr.
3D Systems
26081 Avenue Hall
Valencia, CA 91355
ph: (661) 295-5600 ext. 2508
fx: (661) 295-3404
email: woodsm@3dsystems.com

VALENCIA, Calif., December 2, 1998 - 3D Systems Corporation (Nasdaq NMS: TDSC) announced today the Court of Appeals for the Federal Circuit has reversed a decision of the Los Angeles Federal District Court that had dismissed 3D's lawsuit for patent infringement and unfair competition against Aaroflex, Inc. for lack of jurisdiction. In doing so, the Court of Appeals held that offers by Aaroflex to sell infringing products in California gave rise to personal jurisdiction in California, and the Court of Appeals reinstated the lawsuit.

According to 3D's original complaint, Aaroflex had offered to sell infringing equipment that assertedly offers the same functions as 3D's well-established line of rapid prototyping systems, which have been sold worldwide by 3D for over ten years.

A. Sidney Alpert, 3D's vice president and general counsel, said that Aaroflex will now be forced to answer the complaint charging infringement of six 3D Systems patents and also charging that Aaroflex is engaging in acts of unfair competition, including intentionally misstating comparisons of its equipment with 3D Systems' machines, and falsely describing its own and 3D's patent coverage.

Alpert said that unless Aaroflex appeals or seeks another manner of avoiding an answer to the complaint, a substantive proceeding will begin shortly. Alpert also noted that 3D intends to vigorously pursue all infringers of its patents, including users of the infringing machines, as its patents cover use of the infringing Aaroflex machines, as well as their manufacture and sale.

3D Systems provides solid imaging products and services that let users move quickly from three-dimensional designs to finished parts, at a significantly lower cost and higher quality than more traditional methods. The company's systems - through its patented stereolithography and 3D printing technologies - fabricate solid objects from digital input, substantially cutting the time and costs of bringing new products to market. 3D Systems was founded in 1986 and is recognized as the world leader in solid imaging.

To contact 3D Systems, the telephone number is 805-295-5600, or (toll free) 888-337-9786; fax number is 805-257-1200; e-mail address is moreinfo@3dsystems.com. For investor information, please call 3D Systems' shareholder communications service at 800-757-1799.

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